Fixed documentation

src/de/uni_passau/fim/gitwrapper/Reference.java

@@ -128,10 +128,11 @@ public abstract class Reference {
     }
 
     /**
-     * Checks if this {@link Commit} contains the specified file.
+     * Checks if this {@link Reference} contains the specified file.
      *
-     * @param file The file to check the {@link Commit} for existence.
-     * @return {@code True} if the {@link Commit} contains the file, {@code False} otherwise.
+     * @param file
+     *          the file to check the {@link Commit} for existence
+     * @return {@code True} if the {@link Commit} contains the file, {@code False} otherwise
      */
     public Optional<Boolean> hasFile(Path file) {
         Optional<ProcessExecutor.ExecRes> result = git.exec(repo.getDir(), "cat-file",