[mi, doc] mention escape sequences

[Vladimir Prus <vladimir@codesourcery.com>]

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It does not seem that MI spec ever mentions escape sequence support
(where it's supported) or lack of such support. This patch tries to
fix that. 

Note that parse_escape function supports more than C language escape
sequences, it seems, but given that the function has no comments on
those sequences, and given that manual does not say anything about
that either, I don't feel like reverse-engineering the code to
document the exact rules. "As in C" as sufficient, I think, for MI
manual.

OK?

- Volodya

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Index: gdb/doc/gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.504
diff -u -p -r1.504 gdb.texinfo
--- gdb/doc/gdb.texinfo	10 Jun 2008 10:23:53 -0000	1.504
+++ gdb/doc/gdb.texinfo	11 Jun 2008 14:04:34 -0000
@@ -18018,6 +18018,10 @@ list.  Each option is identified by a le
 followed by an optional argument parameter.  Options occur first in the
 parameter list and can be delimited from normal parameters using
 @samp{--} (this is useful when some parameters begin with a dash).
+
+@item
+Within @var{c-string}, all escape sequences allowed by the C language
+are recognized.  Escape sequences are not allowed in @var{non-blank-sequence}.
 @end itemize
 
 Pragmatics: