Documentation: Use "while" instead of "whilst"

Whilst making an unrelated change to some Documentation, Linus sayeth:

  | Afaik, even in Britain, "whilst" is unusual and considered more
  | formal, and "while" is the common word.
  |
  | [...]
  |
  | Can we just admit that we work with computers, and we don't need to
  | use þe eald Englisc spelling of words that most of the world never
  | uses?

dictionary.com refers to the word as "Chiefly British", which is
probably an undesirable attribute for technical documentation.

Replace all occurrences under Documentation/ with "while".

Cc: David Howells <dhowells@redhat.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/security-bugs.rst

@@ -43,7 +43,7 @@ embargo has lifted; whichever comes first.  The only exception to that
 rule is if the bug is publicly known, in which case the preference is to
 release the fix as soon as it's available.
 
-Whilst embargoed information may be shared with trusted individuals in
+While embargoed information may be shared with trusted individuals in
 order to develop a fix, such information will not be published alongside
 the fix or on any other disclosure channel without the permission of the
 reporter.  This includes but is not limited to the original bug report