Add missing javadoc and since tag for RepoCommand.readFileFromRepo()

Change-Id: Ib0a98ce633e83c82a58b633c767e70d316b7254c
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java

@@ -189,6 +189,20 @@ public byte[] readFile(String uri, String ref, String path)
 			}
 		}
 
+		/**
+		 * Read a file from the repository
+		 *
+		 * @param repo
+		 *            The repository containing the file
+		 * @param ref
+		 *            The ref (branch/tag/etc.) to read
+		 * @param path
+		 *            The relative path (inside the repo) to the file to read
+		 * @return the file's content
+		 * @throws GitAPIException
+		 * @throws IOException
+		 * @since 3.5
+		 */
 		protected byte[] readFileFromRepo(Repository repo,
 				String ref, String path) throws GitAPIException, IOException {
 			ObjectReader reader = repo.newObjectReader();