Fix Javadoc formatting issues for headings

Headings in method-level Javadoc must be h4 or higher in recent versions
of Java.

spring-core/src/main/java/org/springframework/util/AntPathMatcher.java

@@ -529,7 +529,7 @@ public class AntPathMatcher implements PathMatcher {
 	 * the first pattern contains a file extension match (e.g., {@code *.html}).
 	 * In that case, the second pattern will be merged into the first. Otherwise,
 	 * an {@code IllegalArgumentException} will be thrown.
-	 * <h3>Examples</h3>
+	 * <h4>Examples</h4>
 	 * <table border="1">
 	 * <tr><th>Pattern 1</th><th>Pattern 2</th><th>Result</th></tr>
 	 * <tr><td>{@code null}</td><td>{@code null}</td><td>&nbsp;</td></tr>

spring-test/src/main/java/org/springframework/test/context/TestPropertySource.java

@@ -112,11 +112,11 @@ public @interface TestPropertySource {
 	 * {@code Environment}'s set of {@code PropertySources}. Each location
 	 * will be added to the enclosing {@code Environment} as its own property
 	 * source, in the order declared.
-	 * <h3>Supported File Formats</h3>
+	 * <h4>Supported File Formats</h4>
 	 * <p>Both traditional and XML-based properties file formats are supported
 	 * &mdash; for example, {@code "classpath:/com/example/test.properties"}
 	 * or {@code "file:/path/to/file.xml"}.
-	 * <h3>Path Resource Semantics</h3>
+	 * <h4>Path Resource Semantics</h4>
 	 * <p>Each path will be interpreted as a Spring
 	 * {@link org.springframework.core.io.Resource Resource}. A plain path
 	 * &mdash; for example, {@code "test.properties"} &mdash; will be treated as a
@@ -134,9 +134,9 @@ public @interface TestPropertySource {
 	 * in paths (i.e., <code>${...}</code>) will be
 	 * {@linkplain org.springframework.core.env.Environment#resolveRequiredPlaceholders(String) resolved}
 	 * against the {@code Environment}.
-	 * <h3>Default Properties File Detection</h3>
+	 * <h4>Default Properties File Detection</h4>
 	 * <p>See the class-level Javadoc for a discussion on detection of defaults.
-	 * <h3>Precedence</h3>
+	 * <h4>Precedence</h4>
 	 * <p>Properties loaded from resource locations have lower precedence than
 	 * inlined {@link #properties}.
 	 * <p>This attribute may <strong>not</strong> be used in conjunction with
@@ -209,7 +209,7 @@ public @interface TestPropertySource {
 	 * {@code ApplicationContext} is loaded for the test. All key-value pairs
 	 * will be added to the enclosing {@code Environment} as a single test
 	 * {@code PropertySource} with the highest precedence.
-	 * <h3>Supported Syntax</h3>
+	 * <h4>Supported Syntax</h4>
 	 * <p>The supported syntax for key-value pairs is the same as the
 	 * syntax defined for entries in a Java
 	 * {@linkplain java.util.Properties#load(java.io.Reader) properties file}:
@@ -218,7 +218,7 @@ public @interface TestPropertySource {
 	 * <li>{@code "key:value"}</li>
 	 * <li>{@code "key value"}</li>
 	 * </ul>
-	 * <h3>Precedence</h3>
+	 * <h4>Precedence</h4>
 	 * <p>Properties declared via this attribute have higher precedence than
 	 * properties loaded from resource {@link #locations}.
 	 * <p>This attribute may be used in conjunction with {@link #value}

spring-test/src/main/java/org/springframework/test/context/jdbc/Sql.java

@@ -91,7 +91,7 @@ public @interface Sql {
 	 * {@link #value}, but it may be used instead of {@link #value}. Similarly,
 	 * this attribute may be used in conjunction with or instead of
 	 * {@link #statements}.
-	 * <h3>Path Resource Semantics</h3>
+	 * <h4>Path Resource Semantics</h4>
 	 * <p>Each path will be interpreted as a Spring
 	 * {@link org.springframework.core.io.Resource Resource}. A plain path
 	 * &mdash; for example, {@code "schema.sql"} &mdash; will be treated as a
@@ -103,7 +103,7 @@ public @interface Sql {
 	 * {@link org.springframework.util.ResourceUtils#CLASSPATH_URL_PREFIX classpath:},
 	 * {@link org.springframework.util.ResourceUtils#FILE_URL_PREFIX file:},
 	 * {@code http:}, etc.) will be loaded using the specified resource protocol.
-	 * <h3>Default Script Detection</h3>
+	 * <h4>Default Script Detection</h4>
 	 * <p>If no SQL scripts or {@link #statements} are specified, an attempt will
 	 * be made to detect a <em>default</em> script depending on where this
 	 * annotation is declared. If a default cannot be detected, an
@@ -127,7 +127,7 @@ public @interface Sql {
 	 * <em>Inlined SQL statements</em> to execute.
 	 * <p>This attribute may be used in conjunction with or instead of
 	 * {@link #scripts}.
-	 * <h3>Ordering</h3>
+	 * <h4>Ordering</h4>
 	 * <p>Statements declared via this attribute will be executed after
 	 * statements loaded from resource {@link #scripts}. If you wish to have
 	 * inlined statements executed before scripts, simply declare multiple

spring-tx/src/main/java/org/springframework/transaction/annotation/TransactionManagementConfigurer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -51,7 +51,7 @@ public interface TransactionManagementConfigurer {
 	 * Return the default transaction manager bean to use for annotation-driven database
 	 * transaction management, i.e. when processing {@code @Transactional} methods.
 	 * <p>There are two basic approaches to implementing this method:
-	 * <h3>1. Implement the method and annotate it with {@code @Bean}</h3>
+	 * <h4>1. Implement the method and annotate it with {@code @Bean}</h4>
 	 * In this case, the implementing {@code @Configuration} class implements this method,
 	 * marks it with {@code @Bean}, and configures and returns the transaction manager
 	 * directly within the method body:
@@ -61,8 +61,8 @@ public interface TransactionManagementConfigurer {
 	 * public PlatformTransactionManager annotationDrivenTransactionManager() {
 	 *     return new DataSourceTransactionManager(dataSource());
 	 * }</pre>
-	 * <h3>2. Implement the method without {@code @Bean} and delegate to another existing
-	 * {@code @Bean} method</h3>
+	 * <h4>2. Implement the method without {@code @Bean} and delegate to another existing
+	 * {@code @Bean} method</h4>
 	 * <pre class="code">
 	 * &#064;Bean
 	 * public PlatformTransactionManager txManager() {