Edit new paragraph in design doc

doc/user/project/issues/design_management.md

@@ -219,14 +219,14 @@ There are two ways to resolve/unresolve a Design thread:
 
   ![Resolve checkbox](img/resolve_design-discussion_checkbox_v13_1.png)
 
-Resolving a discussion thread will also mark any pending to-do related to notes
-inside the thread as done. This is applicable only for to-dos owned by the user triggering the action.
+Resolving a discussion thread also marks any pending to-do items related to notes
+inside the thread as done. This is applicable only for to-do items owned by the user triggering the action.
 
 Note that your resolved comment pins disappear from the Design to free up space for new discussions.
 However, if you need to revisit or find a resolved discussion, all of your resolved threads are
 available in the **Resolved Comment** area at the bottom of the right sidebar.
 
-## Add to dos for designs
+## Add to-do items for designs
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/198439) in GitLab 13.4.
 > - [Feature flag removed](https://gitlab.com/gitlab-org/gitlab/-/issues/245074) in GitLab 13.5.