Fix javadoc in org.eclipse.jgit storage/io package

Change-Id: I2db781311af79510b26fd05cc0556623e75e3eff
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/io/BlockSource.java

@@ -153,7 +153,7 @@ public abstract class BlockSource implements AutoCloseable {
 	 * @param blockSize
 	 *            size to read.
 	 * @return buffer containing the block content.
-	 * @throws IOException
+	 * @throws java.io.IOException
 	 *             if block cannot be read.
 	 */
 	public abstract ByteBuffer read(long position, int blockSize)
@@ -163,7 +163,7 @@ public abstract class BlockSource implements AutoCloseable {
 	 * Determine the size of the file.
 	 *
 	 * @return total number of bytes in the file.
-	 * @throws IOException
+	 * @throws java.io.IOException
 	 *             if size cannot be obtained.
 	 */
 	public abstract long size() throws IOException;
@@ -180,6 +180,7 @@ public abstract class BlockSource implements AutoCloseable {
 		// Do nothing by default.
 	}
 
+	/** {@inheritDoc} */
 	@Override
 	public abstract void close();
 }