docs(bug-report): require users to read FAQs (#14383)

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -16,6 +16,8 @@ body:
           required: true
         - label: Yes, my issue is not about a specific accessibility audit (file with [axe-core](https://github.com/dequelabs/axe-core) instead).
           required: true
+        - label: Yes, my issue is not answered by [other FAQs](https://github.com/GoogleChrome/lighthouse#faq).
+          required: true
   - type: input
     id: url
     attributes:
@@ -101,4 +103,4 @@ body:
     attributes:
       label: Relevant log output
       description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
-      render: shell
+      render: sh