[PATCH, fortran] Fix a few PRs.

[Tobias Burnus]

Hi Steve and Jerry,
> Steve Kargl wrote:
>>     * fortran/invoke.texi: Document the C escaped characters activated
>>     by -fbackslash.  Improve -fno-range-check description.
The C-escaped characters patch is came up for PR fortran/34203. You
could cite this PR in the ChangeLog.

       If an expression evaluates to a value
+outside of the relevant range of \[@code{-HUGE()}:@code{HUGE()}\],
+then the expression will be replaced by @code{-Inf} or @code{+Inf}
+as appropriate.

Change "\[ ... \]"  into "[ ... ]".


>>     PR libfortran/33583
>>     * libgfortran/gfortran.map: Add tgammaf.
You should also add "tgamma" (double-precision version) and lgamma and
lgammaf, for which also fall-back implementations exists in libgfortran.

Thanks for the patch,

Jerry DeLisle wrote:
> I will commit for you.

Thanks for taking care for this patch.

Tobias