Polish documentation

Closes gh-3738

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/MongoProperties.java

@@ -200,7 +200,7 @@ public class MongoProperties {
 	/**
 	 * Creates a {@link MongoClient} using the given {@code options} and
 	 * {@code environment}. If the configured port is zero, the value of the
-	 * {@code local.server.port} property retrieved from the {@code environment} is used
+	 * {@code local.mongo.port} property retrieved from the {@code environment} is used
 	 * to configure the client.
 	 *
 	 * @param options the options

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -2292,7 +2292,7 @@ path using the `spring.h2.console.path` property.
 
 [[boot-features-sql-h2-console-securing]]
 ==== Securing the H2 console
-When Spring Security is one the and basic auth is enabled, the H2 console will be
+When Spring Security is on the classpath and basic auth is enabled, the H2 console will be
 automatically secured using basic auth. The following properties can be used to customize
 the security configuration:
 

spring-boot-docs/src/main/asciidoc/using-spring-boot.adoc

@@ -775,7 +775,7 @@ entropy for session keys.)
 === Using the Gradle plugin
 The Spring Boot Gradle plugin also includes a `bootRun` task which can be used to run
 your application in an exploded form. The `bootRun` task is added whenever you import
-the `spring-boot-plugin`
+the `spring-boot-gradle-plugin`:
 
 [indent=0,subs="attributes"]
 ----