LU-4423 gss: Fix typo in sec_gss.c

LU-4423 gss: Fix typo in sec_gss.c

This patch fixes spelling typos in comments within sec_gss.c

Came from upstream from Masanari Iida <standby24x7@gmail.com>
commit 08c4c90dc2cfb719b787b39fb9cab9880b60d779

Change-Id: Ibf3543745cc0932a3a560cc274edf95a7411198d
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/10119
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>