x86, doc: Clarify the use of asm("%edx") in uaccess.h

Put in a comment that explains that the use of asm("%edx") in
uaccess.h doesn't actually necessarily mean %edx alone.

Cc: Jamie Lokier <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Russell King <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: H. J. Lu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>

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