Update tagging.asc

Added a brief section on one way to delete tags both locally and remotely.

Author: alexkoziell

book/02-git-basics/sections/tagging.asc

@@ -217,6 +217,25 @@ To [email protected]:schacon/simplegit.git
 
 Now, when someone else clones or pulls from your repository, they will get all your tags as well.
 
+==== Deleting Tags
+
+To delete a tag on your local repository, you can use `git tag -d <tagname>`. For example, we could remove our lightweight tag above as follows: 
+
+[source,console]
+----
+$ git tag -d v1.4-lw
+Deleted tag 'v1.4-lw' (was e7d5add)
+----
+
+Note that this does not remove the tag from any remote servers. In order to update any remotes, you must use `git push <remote> :refs/tags/<tagname>`:
+
+[source,console]
+----
+$ git push origin :refs/tags/v1.4-lw
+To /[email protected]:schacon/simplegit.git
+ - [deleted]         v1.4-lw
+----
+
 ==== Checking out Tags
 
 If you want to view the versions of files a tag is pointing to, you can do a git checkout, though this puts your repository in ``detached HEAD'' state, which has some ill side effects: