Fix guile.texi.

[Tejas Belagod]

Hi,

Attached is a patch that breaks the gdb.pdf build because of unbalanced 
parantheses in guile.texi introduced by this commit:

commit ed3ef33944c39d9a3cea72b9a7cef3c20f0e3461
Author: Doug Evans <xdje42@gmail.com>
Date:   Sun Feb 9 19:40:01 2014 -0800

     Add Guile as an extension language.

         * NEWS: Mention Guile scripting.
         * Makefile.in (SUBDIR_GUILE_OBS): New variable.
         (SUBDIR_GUILE_SRCS, SUBDIR_GUILE_DEPS): New variables
         (SUBDIR_GUILE_LDFLAGS, SUBDIR_GUILE_CFLAGS): New variables.
         (INTERNAL_CPPFLAGS): Add GUILE_CPPFLAGS.
         (CLIBS): Add GUILE_LIBS.
	....

Here is patch that fixes that. With this patch, I could successfully build 
gdb.pdf without any issues.

If this is OK, please could someone apply this for me?

Thanks,
Tejas.

2014-02-11  Tejas Belagod  <tejas.belagod@arm.com>

gdb/
         * docs/guile.texi: Remove stray parantheses for deffn at lines 889 and
	2857.
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