Merge pull request #1863 from petk/patch-changing-master

Add cross reference for changing master

Author: ben

book/03-git-branching/sections/branch-management.asc

@@ -79,7 +79,7 @@ $ git branch --no-merged master
 [CAUTION]
 ====
 Do not rename branches that are still in use by other collaborators.
-Do not rename a branch like master/main/mainline without having read the section "Changing the master branch name".
+Do not rename a branch like master/main/mainline without having read the section <<_changing_master>>.
 ====
 
 Suppose you have a branch that is called `bad-branch-name` and you want to change it to `corrected-branch-name`, while keeping all history.
@@ -123,6 +123,7 @@ $ git push origin --delete bad-branch-name
 
 Now the bad branch name is fully replaced with the corrected branch name.
 
+[[_changing_master]]
 ===== Changing the master branch name
 
 [WARNING]