Merge branch 'ar/submitting-patches-doc-update'

Doc update.

* ar/submitting-patches-doc-update:
  SubmittingPatches: call gitk's command "Copy commit reference"

Author: gitster

Documentation/SubmittingPatches

@@ -266,7 +266,7 @@ date)", like this:
 	noticed that ...
 ....
 
-The "Copy commit summary" command of gitk can be used to obtain this
+The "Copy commit reference" command of gitk can be used to obtain this
 format (with the subject enclosed in a pair of double-quotes), or this
 invocation of `git show`: