Improve JavaDoc on AtomicFile.

/**

 * Helper class for performing atomic operations on a file, by creating a

 * backup file until a write has successfully completed.

 * <p>

 * Atomic file guarantees file integrity by ensuring that a file has

 * been completely written and sync'd to disk before removing its backup.

 * As long as the backup file exists, the original file is considered

 * to be invalid (left over from a previous attempt to write the file).

 * </p><p>

 * Atomic file does not confer any file locking semantics.

 * Do not use this class when the file may be accessed or modified concurrently

 * by multiple threads or processes.  The caller is responsible for ensuring

 * appropriate mutual exclusion invariants whenever it accesses the file.

 * </p>

 */

public class AtomicFile {

    private final File mBaseName;