Add file location warning in comment and nit changes

Author: wangmengyan95

Parse/src/main/java/com/parse/GetDataStreamCallback.java

@@ -39,5 +39,3 @@ public interface GetDataStreamCallback extends ParseCallback2<InputStream, Parse
   @Override
   public void done(InputStream input, ParseException e);
 }
-
-

Parse/src/main/java/com/parse/ParseFile.java

@@ -505,6 +505,8 @@ public void getDataInBackground(GetDataCallback dataCallback) {
    * Synchronously gets the file pointer from cache if available or fetches its content from the
    * network. You probably want to use {@link #getFileInBackground()} instead unless you're already
    * in a background thread.
+   * <strong>Note: </strong> The {@link File} location may change without notice and should not be
+   * stored to be accessed later.
    */
   public File getFile() throws ParseException {
     return ParseTaskUtils.wait(getFileInBackground());
@@ -513,6 +515,8 @@ public File getFile() throws ParseException {
   /**
    * Asynchronously gets the file pointer from cache if available or fetches its content from the
    * network. The {@code ProgressCallback} will be called periodically with progress updates.
+   * <strong>Note: </strong> The {@link File} location may change without notice and should not be
+   * stored to be accessed later.
    *
    * @param progressCallback
    *          A {@code ProgressCallback} that is called periodically with progress updates.
@@ -540,6 +544,8 @@ public Task<File> then(Task<File> task) throws Exception {
   /**
    * Asynchronously gets the file pointer from cache if available or fetches its content from the
    * network.
+   * <strong>Note: </strong> The {@link File} location may change without notice and should not be
+   * stored to be accessed later.
    *
    * @return A Task that is resolved when the data has been fetched.
    */
@@ -553,6 +559,8 @@ public Task<File> getFileInBackground() {
    * The {@code ProgressCallback} will be called periodically with progress updates.
    * The {@code ProgressCallback} is guaranteed to be called with 100 before the
    * {@code GetFileCallback} is called.
+   * <strong>Note: </strong> The {@link File} location may change without notice and should not be
+   * stored to be accessed later.
    *
    * @param fileCallback
    *          A {@code GetFileCallback} that is called when the get completes.
@@ -567,6 +575,8 @@ public void getFileInBackground(GetFileCallback fileCallback,
   /**
    * Asynchronously gets the file pointer from cache if available or fetches its content from the
    * network. The {@code GetFileCallback} will be called when the get completes.
+   * <strong>Note: </strong> The {@link File} location may change without notice and should not be
+   * stored to be accessed later.
    *
    * @param fileCallback
    *          A {@code GetFileCallback} that is called when the get completes.