Clarify guidelines around use of role pings in discord (tgstation#67639)

Co-authored-by: san7890 <[email protected]>
Co-authored-by: Kyle Spier-Swenson <[email protected]>

.github/CONTRIBUTING.md

@@ -191,3 +191,9 @@ Unless overridden or a non standard git binary is used the line ending settings
 Note: VSC requires an [extension](https://marketplace.visualstudio.com/items?itemName=EditorConfig.EditorConfig) to take advantage of editorconfig.
 
 Github actions that require additional configuration are disabled on the repository until ACTION_ENABLER secret is created with non-empty value.
+
+## Using the Maintainer Role Ping in Discord
+
+This role `@Maintainer` is pingable as a compromise reached with the server host MrStonedOne over the auto-stale system we presently have in the codebase. It should be used only to ping Maintainers when your PR has had the "Stale" label applied. Using it before then can be met with escalating timeouts and referral to /tg/station's Discord moderators for further infractions.
+
+Feel free to engage and obtain general feedback in the Coding General channel without the role ping before your PR goes stale to build interest and get reviews.