Polish

See gh-32215

buildSrc/src/main/java/org/springframework/boot/build/docs/ApplicationRunner.java

@@ -185,7 +185,7 @@ public class ApplicationRunner extends DefaultTask {
 		List<String> normalizedLines = new ArrayList<>();
 		for (String line : lines) {
 			Matcher matcher = pattern.matcher(line);
-			StringBuffer transformed = new StringBuffer();
+			StringBuilder transformed = new StringBuilder();
 			while (matcher.find()) {
 				matched = true;
 				matcher.appendReplacement(transformed, replacement);

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/health/HealthEndpointWebExtensionRuntimeHintsTests.java

@@ -31,7 +31,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Moritz Halbritter
  */
-class HealthEndpointWebExtensionRuntimeHintsTest {
+class HealthEndpointWebExtensionRuntimeHintsTests {
 
 	@Test
 	void shouldRegisterHints() {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/template/TemplateRuntimeHintsTests.java

@@ -30,13 +30,13 @@ import org.springframework.core.io.ClassPathResource;
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
- * Tests for {@link TemplateRuntimeHints}.$
+ * Tests for {@link TemplateRuntimeHints}.
  *
  * @author Stephane Nicoll
  */
 class TemplateRuntimeHintsTests {
 
-	public static final Predicate<RuntimeHints> TEST_PREDICATE = RuntimeHintsPredicates.resource()
+	private static final Predicate<RuntimeHints> TEST_PREDICATE = RuntimeHintsPredicates.resource()
 			.forResource("templates/something/hello.html");
 
 	@Test

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/PropertyMapper.java

@@ -295,8 +295,8 @@ public final class PropertyMapper {
 		}
 
 		/**
-		 * Complete the mapping for any non-filtered value by apply the given function to
-		 * an existing instance and returning a new one. For filtered values, the
+		 * Complete the mapping for any non-filtered value by applying the given function
+		 * to an existing instance and returning a new one. For filtered values, the
 		 * {@code instance} parameter is returned unchanged. The method is designed to be
 		 * used with immutable objects.
 		 * @param <R> the result type