* cygwinenv.xml (cygwinenv-implemented-options): Explain new

	* cygwinenv.xml (cygwinenv-implemented-options): Explain new
	winsymliks:nativestrict option.  Strip out description of symlink types
	and refer to new pathnames-symlinks section.
	* highlights.xml (ov-hi-files): Rip out most of symlink description and
	refer to new pathnames-symlinks section instead.
	* new-features.xml (ov-new1.7.19): Add CYGWIN=winsymlinks:nativestrict.
	* pathnames.xml (pathnames-symlinks): New section describing symbolic
	link handling.