Improve english text

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

doc/api/tags.md

@@ -40,7 +40,7 @@ Parameters:
 ## Create a new tag
-Creates new tag in the repository that points to the supplied ref.
+Creates a new tag in the repository that points to the supplied ref.
 ```
 POST /projects/:id/repository/tags

doc/workflow/releases.md

 # Releases
-You can turn any git tag into release by just adding a release notes to it. 
-Release notes behaves like any other markdown form in GitLab so you can write text and drag-n-drop files to it.
-Release notes are stored in GitLab database. 
+You can turn any git tag into a release, by adding a note to it.
+Release notes behave like any other markdown form in GitLab so you can write text and drag-n-drop files to it.
+Release notes are stored in the database of GitLab. 
 There are several ways to add release notes: 
-* In UI when you create new git tag with GitLab
-* In UI when you add release notes to existing git tag
-* with GitLab API
+* In the interface, when you create a new git tag with GitLab
+* In the interface, by adding a note to an existing git tag
+* with the GitLab API
 ## New tag page with release notes text area