With old makeinfo (version 4.13) the changes introduced in

commit 2d97a5d9d33aea87c3bd02fd1fa417f5d4e1fa05
Author:     John Baldwin <jhb@FreeBSD.org>

    Document support for 'info proc' on FreeBSD.

fail to build.

(committed as obvious)

gdb/doc/ChangeLog:

2018-01-11  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* gdb.texinfo (pwd): Fix whitespace.