doc: Clarify FENV_ACCESS pragma semantics WRT `-ftrapping-math'

Our documentation indicates that it is the `-frounding-math' invocation
option that controls whether we respect what the FENV_ACCESS pragma
would imply, should we implement it, regarding the floating point
environment.  It is only a part of the picture however, because the
`-ftrapping-math' invocation option also affects how we handle said
environment.  Clarify that in the description of both options then, as
well as the FENV_ACCESS pragma itself.

	gcc/
	* doc/implement-c.texi (Floating point implementation): Mention
	`-fno-trapping-math' in the context of FENV_ACCESS pragma.
	* doc/invoke.texi (Optimize Options): Clarify FENV_ACCESS pragma
	implication in the descriptions of `-fno-trapping-math' and
	`-frounding-math'.

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