[doc/api]Remove space within word
[doc/api]Remove space within word

Following two words should not have space.
 X-Subject-Token
 X-Auth-Token
But currently these two words have CR within these words,
This causes redundunt spaces.

http://developer.openstack.org/api-ref/identity/v3/authenticate-v3.html

Change-Id: I3ae39cdaf19b73b5f7750eeb9b01d1447e2ca73a

openstack/keystone,openstack/keystone,ilay09/keystone,mahak/keystone,openstack/keystone,ilay09/keystone,ilay09/keystone,mahak/keystone,rajalokan/keystone,cernops/keystone,cernops/keystone,mahak/keystone,rajalokan/keystone,rajalokan/keystone