Update "request for comments" issue template (#3177)

* Update "request for comments" issue template

Replace "nightly build" phrase with "non-release build".

Resolves #3176

* Update request-for-comments.md

Use "alpha" instead of "non-release".

.github/ISSUE_TEMPLATE/request-for-comments.md

@@ -25,6 +25,6 @@ Documentation of any other items researched for resolution.
 Please add X in at least one of the boxes as appropriate. In order for an issue to be accepted, a developer needs to be able to reproduce the issue on a currently supported version. If you are looking for a workaround for an issue with an older version, please visit the forums at https://dnncommunity.org/forums
 -->
 
-* [ ] 10.0.0 nightly build
-* [ ] 9.4.1 nightly build
+* [ ] 10.0.0 alpha build
+* [ ] 9.4.1 alpha build
 * [ ] 9.4.0 latest supported release