Politely ask people not to submit issues to add support for unknown keyboards. (#19737)

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -7,6 +7,9 @@ body:
     attributes:
       value: |
         Provide a general summary of the changes you want in the title above.
+
+        Please refrain from asking maintainers to add support for specific keyboards -- it is unlikely they will have hardware available, and will not be able to help.
+        Your best bet is to take the initiative, add support, then submit a PR yourself.
   - type: checkboxes
     attributes:
       label: Feature Request Type

.github/ISSUE_TEMPLATE/other_issues.yml

@@ -10,6 +10,9 @@ body:
     attributes:
       value: |
         Please check [https://docs.qmk.fm/#/support](https://docs.qmk.fm/#/support) for additional resources first. If that doesn't answer your question, choose the bug report template instead, as that may be more appropriate.
+
+        Please refrain from asking maintainers to add support for specific keyboards -- it is unlikely they will have hardware available, and will not be able to help.
+        Your best bet is to take the initiative, add support, then submit a PR yourself.
   - type: textarea
     attributes:
       label: Issue Description