[PATCH] pcmcia: update documentation

Update the PCMCIA documentation to reflect some more, though older, changes.
Parts extracted from an e-mail from Randy Dunlap with his consent.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>