Documentation: quoting trouble in "git rm" discussion

Documentation: quoting trouble in "git rm" discussion

The current output (with Asciidoc 8.5.2) seems a bit broken:

	given two directories ‘d` and d2, there is a difference
	between using git rm 'd*’ and ‘git rm 'd/\*\’`, as the
	former will also remove all of directory d2.

In other words, the markup parses as

	given two directories << d` and _d2_, there is a difference
	between using _git rm 'd* >>_ and << git rm 'd/\*\ >> `.

I suspect there is an asciidoc bug involved (why is ' a candidate
closing-quote mark when it is preceded by a backslash?) but with
all the meanings of ` and ' involved I do not want to track it
down.  Better to use unambiguous {asterisk} and {apostrophe}
entities.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>