Restore nuanced phrasing with commas

This commit rewrites one sentence to provide a nuance of meaning
while not running afoul of the Oxford comma rule. It also restores
the phrasing in another sentence while wrapping the paragraph in
tags that disable the Oxford comma test on the paragraph.

doc/user/project/issues/index.md

@@ -6,9 +6,14 @@ Issues are the fundamental medium for collaborating on ideas and planning work i
 
 The GitLab issue tracker is an advanced tool for collaboratively developing ideas, solving problems, and planning work.
 
-Issues can allow you and your team to share and discuss proposals
-before, and during, their implementation. However, they can be used for a variety of
-other purposes, customized to your needs and workflow.
+Issues can allow sharing and discussion of proposals before, and during,
+their implementation between:
+
+- You and your team.
+- Outside collaborators.
+
+They can also be used for a variety of other purposes, customized to your
+needs and workflow.
 
 Issues are always associated with a specific project, but if you have multiple projects in a group,
 you can also view all the issues collectively at the group level.

doc/user/project/pipelines/schedules.md

@@ -116,12 +116,17 @@ The next time a pipeline is scheduled, your credentials will be used.
 
 ![Schedules list](img/pipeline_schedules_ownership.png)
 
-NOTE: **Note:**
-If the owner of a pipeline schedule doesn't have the ability to create pipelines
-on the target branch, the schedule will stop creating new pipelines. This can
-happen if the owner is blocked or removed from the project, or
-the target branch or tag is protected. In this case, someone with sufficient
-privileges must take ownership of the schedule.
+If the owner of a pipeline schedule doesn't have the ability to create
+pipelines on the target branch, the schedule will stop creating new
+pipelines.
+
+This can happen if, for example:
+
+- The owner is blocked or removed from the project.
+- The target branch or tag is protected.
+
+In this case, someone with sufficient privileges must take ownership of the
+schedule.
 
 <!-- ## Troubleshooting