RFA: fix documentation for file -readnow

[Tom Tromey <tromey@redhat.com>]

This patch fixes PR cli/8830.

The bug is that a user got confused by the documentation, which reads:

`symbol-file FILENAME [ -readnow ]'
`file FILENAME [ -readnow ]'
   [...]

It turns out that file and symbol-file only accept -readnow as the first
argument.

This patch fixes the documentation to reflect the code.

Ok?

Tom

2010-02-04  Tom Tromey  <tromey@redhat.com>

	PR cli/8830:
	* gdb.texinfo (Files): -readnow comes before the filename for file
	and symbol-file.

Index: gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.663
diff -u -r1.663 gdb.texinfo
--- gdb.texinfo	1 Feb 2010 16:09:22 -0000	1.663
+++ gdb.texinfo	4 Feb 2010 18:22:43 -0000
@@ -13825,8 +13825,8 @@
 @kindex readnow
 @cindex reading symbols immediately
 @cindex symbols, reading immediately
-@item symbol-file @var{filename} @r{[} -readnow @r{]}
-@itemx file @var{filename} @r{[} -readnow @r{]}
+@item symbol-file @r{[} -readnow @r{]} @var{filename}
+@itemx file @r{[} -readnow @r{]} @var{filename}
 You can override the @value{GDBN} two-stage strategy for reading symbol
 tables by using the @samp{-readnow} option with any of the commands that
 load symbol table information, if you want to be sure @value{GDBN} has the