Update API spec files to describe the correct class

Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/requests/api/geo_spec.rb

 require 'spec_helper'
 
-describe API::API, api: true do
+describe API::Geo, api: true do
   include ApiHelpers
   let(:admin) { create(:admin) }
   let(:user) { create(:user) }

spec/requests/api/ldap_group_links_spec.rb

 require 'spec_helper'
 
-describe API::API, api: true  do
+describe API::LdapGroupLinks, api: true  do
   include ApiHelpers
 
   let(:owner) { create(:user) }

spec/requests/api/ldap_spec.rb

 require 'spec_helper'
 
-describe API::API do
+describe API::Ldap do
   include ApiHelpers
   include LdapHelpers
 

spec/requests/api/license_spec.rb

 require 'spec_helper'
 
-describe API::API, api: true  do
+describe API::License, api: true  do
   include ApiHelpers
 
   let(:gl_license)  { build(:gitlab_license) }

spec/requests/api/project_push_rule_spec.rb

 require 'spec_helper'
 
-describe API::API, 'ProjectPushRule', api: true  do
+describe API::ProjectPushRule, 'ProjectPushRule', api: true  do
   include ApiHelpers
   let(:user) { create(:user) }
   let(:user3) { create(:user) }