Merge branch 'kh/doc-rerere-options-xref'

Doc update.

* kh/doc-rerere-options-xref:
  doc: rerere-options.adoc: link to git-rerere(1)

Documentation/rerere-options.adoc

@@ -4,6 +4,6 @@
 	the current conflict to update the files in the working
 	tree, allow it to also update the index with the result of
 	resolution.  `--no-rerere-autoupdate` is a good way to
-	double-check what `rerere` did and catch potential
+	double-check what linkgit:git-rerere[1] did and catch potential
 	mismerges, before committing the result to the index with a
-	separate `git add`.
+	separate linkgit:git-add[1].