Documentation: add missing quotes to "git grep" examples
Documentation: add missing quotes to "git grep" examples

Without an indication to the contrary, Asciidoc puts 'quoted
text' in italics, making the output look like this:

	git grep time_t -- *.[ch]
	    Looks for time_t in all tracked .c and .h
	    files in the working directory and its subdirectories.

	git grep -e '#define\' --and \( -e MAX_PATH -e PATH_MAX \)
	    Looks for a line that has #define and either MAX_PATH or
	    PATH_MAX.

In the first example, the *.[ch] argument needs to be protected from
the shell, or else it will only match files in the current directory.
The second example has a stray backslash.

Reported-by: Frédéric Brière <138584a8b44c8500926cbe73211e2823dae3b65e@fbriere.net>
Cc: Mark Lodato <738d89f400ad91f3217df2163c1bf022dea21574@gmail.com>
Cc: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>
Signed-off-by: Jonathan Nieder <b57189c5f2fd5b3daf3350a77fde90def1080fa5@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git