Remove reference to "if unsure if a bug" (#31820)

Author: oxinabox

.github/ISSUE_TEMPLATE.md

@@ -1,6 +1,5 @@
-If you have a question or are unsure if the behavior you're experiencing is a bug,
-please search or post to our Discourse site: https://discourse.julialang.org. We use
-the GitHub issue tracker for bug reports and feature requests only.
+If you have a question please search or post to our Discourse site: https://discourse.julialang.org.
+We use the GitHub issue tracker for bug reports and feature requests only.
 
 If you're submitting a bug report, be sure to include as much relevant information as
 possible, including a minimal reproducible example and the output of `versioninfo()`.