libgomp.texi: Add the missing closing brace

Fix GCC build error:

libgomp.texi:647: @code missing closing brace
make[4]: *** [Makefile:1434: stamp-build-info] Error 1

from

commit a94fc2737d4c3916cdab15e2f2e28f74b6c39e65
Author: Tobias Burnus <tburnus@baylibre.com>
Date:   Wed May 13 08:21:53 2026 +0200

    libgomp: Add stub omp_control_tool for OMPT

-@item New @code{omp_pause_stop_tool} constant for omp_pause_resource @tab N @tab
+@item New @code{omp_pause_stop_tool} constant for @code{omp_pause_resource
+      @tab Y @tab

	* libgomp.texi: the Add missing closing brace.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>