cpp.texi (Invocation): Revise to indicate that GCC driver options are only documented...

cpp.texi (Invocation): Revise to indicate that GCC driver options are only documented in the GCC manual.

2016-12-25  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/cpp.texi (Invocation): Revise to indicate that GCC driver
	options are only documented in the GCC manual.
	* doc/cppopts.texi: Delete documentation of GCC driver options
	-o, -Wall, -Wtraditional, -Werror, -Wsystem-headers, -w,
	-pedantic, -pedantic-errors, -std=, -ansi, --help, --target-help,
	-v, -version.  Update -Wcomment, -Wtrigraphs, -Wundef,
	-Wexpansion-to-defined, -Wno-endif-labels, -traditional,
	-traditional-cpp, -trigraphs to merge text previously in GCC manual.
	* doc/invoke.texi (Option Summary): Move -trigraphs, -traditional,
	and -traditional-cpp from C dialect options to preprocessor options.
	(C Dialect Options): Likewise.
	(Warning Options): Delete documentation of -Wcomment, -Wtrigraphs,
	-Wexpansion-to-defined, -Wundef, and -Wno-endif-labels.

From-SVN: r243923