Merge branch 'jc/prompt-document-ps1-state-separator' into maint

Docfix.

* jc/prompt-document-ps1-state-separator:
  git-prompt.sh: document GIT_PS1_STATESEPARATOR

contrib/completion/git-prompt.sh

@@ -66,6 +66,10 @@
 #     git           always compare HEAD to @{upstream}
 #     svn           always compare HEAD to your SVN upstream
 #
+# You can change the separator between the branch name and the above
+# state symbols by setting GIT_PS1_STATESEPARATOR. The default separator
+# is SP.
+#
 # By default, __git_ps1 will compare HEAD to your SVN upstream if it can
 # find one, or @{upstream} otherwise.  Once you have set
 # GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by