Editorial revisions for tone and style

Changes to the page that bring it closer to GitLab tone and style,
including condensing subheadings, removing gerunds, and making
linking text as semantically valid and helpful as possible.

doc/operations/metrics/dashboards/develop.md

@@ -10,24 +10,24 @@ GitLab provides a template to make it easier for you to create templates for
 [custom dashboards](index.md). Templates provide helpful guidance and
 commented-out examples you can use.
 
-## Applying dashboard template
+## Apply a dashboard template
 
 Navigate to the browser-based editor of your choice:
 
-### *Repository view*
+- In the **Repository view**:
 
   1. Navigate to **{doc-text}** **Repository > Files**.
   1. Click **{plus}** **Add to tree** and select **New file**,
-             then click **Select a template type** to see a list of available templates:
-             ![Metrics dashboard template selection](img/metrics_dashboard_template_selection_v13_3.png)
+     then click **Select a template type** to see a list of available templates:
+     ![Metrics dashboard template selection](img/metrics_dashboard_template_selection_v13_3.png)
 
-### *[Web IDE](../../../user/project/web_ide/index.md)* 
+- In the **[Web IDE](../../../user/project/web_ide/index.md)**:
 
   1. Click **Web IDE** when viewing your repository.
   1. Click **{doc-new}** **New file**, then click **Choose a template** to see a list of available templates:
-  ![Metrics dashboard template selection WebIDE](img/metrics_dashboard_template_selection_web_ide_v13_3.png)
+     ![Metrics dashboard template selection WebIDE](img/metrics_dashboard_template_selection_web_ide_v13_3.png)
 
-## Custom dashboard template **(PREMIUM ONLY)**
+## Custom dashboard templates **(PREMIUM ONLY)**
 
-To enable and use a custom dashboard templates on your GitLab instance please follow
-[general guide](../../../user/admin_area/settings/instance_template_repository.md) on custom file templates
+To enable and use a custom dashboard templates on your GitLab instance, read the
+[guide for creating custom templates](../../../user/admin_area/settings/instance_template_repository.md).