gcc: docs: Fix documentation of two hooks

The `function_attribute_inlinable_p` hook documentation described it
returning the value if it is OK to inline the provided fndecl into "the
current function".  AFAICS This hook is only called when
`current_function_decl` is the same as the `fndecl` argument that the
hook is given, hence asking whether `fndecl` can be inlined into "the
current function" doesn't seem relevant.  Moreover from what I see no
existing implementation of `function_attribute_inlinable_p` uses "the
current function" in any way.
Update the documentation to match this understanding.

The `unspec_may_trap_p` documentation mentioned applying to either
`unspec` or `unspec_volatile`.  AFAICS this hook is only used for
`unspec` codes since c84a808e493a, so I removed the mention of
`unspec_volatile`.

gcc/ChangeLog:

	* doc/tm.texi: Regenerated.
	* target.def (function_attribute_inlinable_p,
	unspec_may_trap_p): Update documentation.

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