Documentation update: use git branch -d foo where applicable

This updates documentation to use git branch -d foo in favour of
rm .git/refs/heads/foo

Signed-off-by: Kai Ruemmler <kai.ruemmler@gmx.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/Documentation/howto/rebase-and-edit.txt b/Documentation/howto/rebase-and-edit.txt
index 6cc1c79..646c55c 100644
--- a/Documentation/howto/rebase-and-edit.txt
+++ b/Documentation/howto/rebase-and-edit.txt
@@ -63,7 +63,7 @@
 don't want it:
 
 	# remove 'broken' branch
-	rm .git/refs/heads/broken
+	git branch -d broken
 
 	# Prune old objects if you're really really sure
 	git prune
diff --git a/Documentation/howto/revert-branch-rebase.txt b/Documentation/howto/revert-branch-rebase.txt
index e4cce5b..5a7e0cf 100644
--- a/Documentation/howto/revert-branch-rebase.txt
+++ b/Documentation/howto/revert-branch-rebase.txt
@@ -153,7 +153,8 @@
 nor tag anymore, so remove them:
 
 ------------------------------------------------
-$ rm -f .git/refs/tags/pu-anchor .git/refs/heads/revert-c99
+$ rm -f .git/refs/tags/pu-anchor 
+$ git branch -d revert-c99
 ------------------------------------------------
 
 It was an emergency fix, so we might as well merge it into the
diff --git a/Documentation/howto/using-topic-branches.txt b/Documentation/howto/using-topic-branches.txt
index d30fa85..c6c635a 100644
--- a/Documentation/howto/using-topic-branches.txt
+++ b/Documentation/howto/using-topic-branches.txt
@@ -166,7 +166,7 @@
 
 is empty.  At this point the branch can be deleted:
 
- $ rm .git/refs/heads/branchname
+ $ git branch -d branchname
 
 Some changes are so trivial that it is not necessary to create a separate
 branch and then merge into each of the test and release branches.  For