(DOCSP-36534) Adds admonition to delete one endpoint. (#728)

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- [JIRA](https://jira.mongodb.org/browse/DOCSP-45773)
-
[STAGING](https://deploy-preview-728--docs-ops-manager.netlify.app/reference/api/groups/delete-one-group/)
Will backport to v8.0 and v7.0.

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Author: erabil-mdb

source/includes/important-delete-project.rst

@@ -0,0 +1,13 @@
+.. important::
+
+   Deleting a project removes all the project's artifacts, including
+   all monitoring data. |mms| no longer displays the project in
+   selection lists. You can't delete a project that has managed 
+   deployments.
+
+   You can delete a project if:
+
+   - You have :authrole:`Project Owner` access for the project.
+
+   - The project has no backups. To terminate your backups prior to
+     removing the project, see :ref:`terminate-backup`.

source/reference/api/groups/delete-one-group.txt

@@ -10,6 +10,8 @@ Delete One Project
    :depth: 2
    :class: singlecol
 
+.. include:: /includes/important-delete-project.rst
+
 .. include:: /includes/fact-groups-projects-synonyms.rst
 
 .. include:: /includes/api/base-api-uri.rst

source/tutorial/manage-projects.txt

@@ -75,19 +75,8 @@ Move One Project from One Organization to Another
 Delete One Project
 ------------------
 
-.. important::
-
-   Deleting a project removes all the project's artifacts, including
-   all monitoring data. |mms| no longer displays the project in
-   selection lists. You can't delete a project that has managed 
-   deployments.
-
-   You can delete a project if:
-
-   - You have the :authrole:`Project Owner` access for the project.
 
-   - The project has no backups. To terminate your backups prior to
-     removing the project, see :ref:`terminate-backup`.
+.. include:: /includes/important-delete-project.rst
 
 .. include:: /includes/steps/remove-group.rst