[patch,openacc] Better distinguish OpenACC and OpenMP sections in libgomp.texi

[Cesar Philippidis]

This patch updates the libgomp documentation to more clearly identify
OpenMP-specific sections. Specifically, the sections "Runtime Library
Routine" and "Environment Variables" are now prefixed by OpenMP, because
those sections are applicable to OpenACC.

Is this OK for trunk? I verified that libgomp.pdf looks ok.

Thanks,
Cesar
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