Fix minor styling issues from code review

doc/api/tags.md

@@ -40,8 +40,8 @@ Parameters:
 
 ## Get a single repository tag
 
-Get a specific repository tag determined by its name. It returns 200 together
-with the tag information if the tag exists. It returns 404 if the tag does not
+Get a specific repository tag determined by its name. It returns `200` together
+with the tag information if the tag exists. It returns `404` if the tag does not
 exist.
 
 ```

lib/api/tags.rb

@@ -23,7 +23,7 @@ module API
       #   tag_name (required) - The name of the tag
       # Example Request:
       #   GET /projects/:id/repository/tags/:tag_name
-      get ":id/repository/tags/:tag_name", requirements: { tag_name: /.*/ } do
+      get ":id/repository/tags/:tag_name", requirements: { tag_name: /.+/ } do
         tag = user_project.repository.find_tag(params[:tag_name])
         not_found!('Tag') unless tag
 

spec/requests/api/tags_spec.rb

@@ -40,17 +40,17 @@ describe API::API, api: true  do
     end
   end
 
-  describe "GET /projects/:id/repository/tags/:tag_name" do
+  describe 'GET /projects/:id/repository/tags/:tag_name' do
     let(:tag_name) { project.repository.tag_names.sort.reverse.first }
 
-    it 'should return a specific tag' do
+    it 'returns a specific tag' do
       get api("/projects/#{project.id}/repository/tags/#{tag_name}", user)
 
       expect(response.status).to eq(200)
       expect(json_response['name']).to eq(tag_name)
     end
 
-    it 'should return 404 for an invalid tag name' do
+    it 'returns 404 for an invalid tag name' do
       get api("/projects/#{project.id}/repository/tags/foobar", user)
 
       expect(response.status).to eq(404)