Merge branch 'mg/texinfo-5'

Strip @anchor elements in the texinfo output of the documentation,
as a single document created by concatenating our entire manual set
will produce many duplicates that makes newer texinfo unhappy.

* mg/texinfo-5:
  Documentation: Strip texinfo anchors to avoid duplicates

Author: gitster

Documentation/cat-texi.perl

@@ -12,6 +12,7 @@
 		push @menu, $1;
 	}
 	s/\(\@pxref{\[(URLS|REMOTES)\]}\)//;
+	s/\@anchor\{[^{}]*\}//g;
 	print TMP;
 }
 close TMP;