Also remove the backslashes from the two syntaxes that contained them.

This completes the fix for https://savannah.gnu.org/bugs/?51370.

The comment marker is not «."» but «.\"», which requires three
backslashes to specify.  Also adjust the documentation.

They are not documentation, they are functional elements of nano.

This allows for commenting or uncommenting a line or a bunch of lines
with a single keystroke (default binding: M-3).  The characters used
for commenting/uncommenting are specified by the active syntax file.
Reviewed-by: Benno Schulenberg <bensberg@justemail.net>
Signed-off-by: Mike Scalora <mike@scalora.org>

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5223 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4899 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

they're installed properly and nanorc.sample references them properly


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3604 35c25a1d-7b9e-4130-9fde-d3aeb78583b8