Fix typo

Closes gh-3411

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/classpath/ClassPathFileSystemWatcher.java

@@ -48,8 +48,8 @@ public class ClassPathFileSystemWatcher implements InitializingBean, DisposableB
 
 	/**
 	 * Create a new {@link ClassPathFileSystemWatcher} instance.
-	 * @param fileSystemWatcherFactory the underlying {@link FileSystemWatcher} used to
-	 * monitor the local file system
+	 * @param fileSystemWatcherFactory a factory to create
+	 * the underlying {@link FileSystemWatcher} used to monitor the local file system
 	 * @param restartStrategy the classpath restart strategy
 	 * @param urls the URLs to watch
 	 */

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/filewatch/FileSystemWatcher.java

@@ -96,7 +96,7 @@ public class FileSystemWatcher {
 	}
 
 	/**
-	 * Add a source folders to monitor. Cannot be called after the watcher has been
+	 * Add source folders to monitor. Cannot be called after the watcher has been
 	 * {@link #start() started}.
 	 * @param folders the folders to monitor
 	 */

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/filewatch/FolderSnapshot.java

@@ -166,7 +166,7 @@ class FolderSnapshot {
 
 	@Override
 	public String toString() {
-		return this.folder + " snaphost at " + this.time;
+		return this.folder + " snapshot at " + this.time;
 	}
 
 }

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/Restarter.java

@@ -233,7 +233,7 @@ public class Restarter {
 
 	/**
 	 * Restart the running application.
-	 * @param failureHandler a failure handler to deal with application that don't start
+	 * @param failureHandler a failure handler to deal with application that doesn't start
 	 */
 	public void restart(final FailureHandler failureHandler) {
 		if (!this.enabled) {
@@ -255,7 +255,7 @@ public class Restarter {
 
 	/**
 	 * Start the application.
-	 * @param failureHandler a failure handler for application that wont start
+	 * @param failureHandler a failure handler for application that won't start
 	 * @throws Exception
 	 */
 	protected void start(FailureHandler failureHandler) throws Exception {