[patch] ptrace.2: Add note regarding 'struct user'

[Anoop <acv-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>]

A few days back Roland McGrath discussed about the ptrace  
PTRACE_PEEKUSER behavior @ http://lkml.org/lkml/2008/5/8/375

Thought that adding a note saying - the offsets and data returned  
might not match with the definition of struct user - will help.

Signed-off-by: Anoop Vijayan <acv-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>

--- man-pages-2.79/man2/ptrace.2.orig   2008-05-17 12:54:50.000000000 +0530
+++ man-pages-2.79/man2/ptrace.2        2008-05-17 13:45:53.000000000 +0530
@@ -138,7 +138,7 @@ The word is returned as the result of th
  .BR ptrace ()
  call.
  Typically the offset must be word-aligned, though this might vary by
-architecture.  (\fIdata\fP is ignored.)
+architecture. See NOTES. (\fIdata\fP is ignored.)
  .TP
  .BR PTRACE_POKETEXT ", " PTRACE_POKEDATA
  Copies the word
@@ -454,7 +454,9 @@ behavior.
  the process with PID 1, may not be traced.
  .LP
  The layout of the contents of memory and the USER area are quite OS- and
-architecture-specific.
+architecture-specific. The offset supplied and the data returned might
+not entirely match with the definition of
+.I struct user
  .LP
  The size of a "word" is determined by the OS variant
  (e.g., for 32-bit Linux it is 32 bits, etc.).

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