Fix javadoc leftovers in org.eclipse.jgit api package

Change-Id: I2150889b5ed04e8739e2367fc9023b750b516398
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/CheckoutCommand.java

@@ -731,7 +731,7 @@ public class CheckoutCommand extends GitCommand<Ref> {
 	}
 
 	/**
-	 * <p>getResult.</p>
+	 * Get the result, never <code>null</code>
 	 *
 	 * @return the result, never <code>null</code>
 	 */

org.eclipse.jgit/src/org/eclipse/jgit/api/TransportCommand.java

@@ -129,11 +129,10 @@ public abstract class TransportCommand<C extends GitCommand, T> extends
 		return self();
 	}
 
-	/** @return {@code this} */
 	/**
-	 * Return this command
+	 * Return this command cast to {@code C}
 	 *
-	 * @return this command
+	 * @return {@code this} cast to {@code C}
 	 */
 	@SuppressWarnings("unchecked")
 	protected final C self() {