Fix wrong endpoint in api/users documentation, fix same typo in spec describe blocks

doc/api/users.md

@@ -643,7 +643,7 @@ Parameters:
 | `id` | integer | yes | The ID of the user |
 ```bash
-curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/user/:id/events
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/users/:id/events
 ```
 Example response:

spec/requests/api/users_spec.rb

@@ -846,7 +846,7 @@ describe API::API, api: true  do
     end
   end
-  describe 'PUT /user/:id/block' do
+  describe 'PUT /users/:id/block' do
     before { admin }
     it 'blocks existing user' do
       put api("/users/#{user.id}/block", admin)
@@ -873,7 +873,7 @@ describe API::API, api: true  do
     end
   end
-  describe 'PUT /user/:id/unblock' do
+  describe 'PUT /users/:id/unblock' do
     let(:blocked_user)  { create(:user, state: 'blocked') }
     before { admin }
@@ -914,7 +914,7 @@ describe API::API, api: true  do
     end
   end
-  describe 'GET /user/:id/events' do
+  describe 'GET /users/:id/events' do
     let(:user) { create(:user) }
     let(:project) { create(:empty_project) }
     let(:note) { create(:note_on_issue, note: 'What an awesome day!', project: project) }