Expand AMP issue template intro text (ampproject#34397)

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -7,31 +7,33 @@ body:
   id: header
   attributes:
     value: |
-      Thanks for filling out this bug report. Please only file reports about [AMP](https://amp.dev) here.
-      - If you have questions about how to use AMP, try the [`#using-amp`](https://amphtml.slack.com/archives/C9HPA6HGB) Slack channel, or the [`amp-html`](http://stackoverflow.com/questions/tagged/amp-html) tag at Stack Overflow.
-      - If you have questions about Google Search, ask them at Google's [Help Community](https://goo.gl/utQ1KZ).
+      Thanks for filling out this bug report.
+      - Bugs related to the [AMP](https://amp.dev) format and cache can be reported using the form below.
+      - Bugs related to the [AMP Wordpress Plugin](https://wordpress.org/plugins/accelerated-mobile-pages/) can be reported at the [`amp-wp`](https://github.com/ampproject/amp-wp/issues) repository.
+      - Questions about AMP uage can be asked at the [`#using-amp`](https://amphtml.slack.com/archives/C9HPA6HGB) Slack channel or the [`amp-html`](http://stackoverflow.com/questions/tagged/amp-html) tag at Stack Overflow.
+      - Questions about Google Search can be asked at Google's [Help Community](https://goo.gl/utQ1KZ).
 - type: textarea
   id: description
   attributes:
     label: Description
     description: Briefly describe the bug.
-    placeholder: Describing the expected versus the current behaviour will help us to understand where we should assign the investigation of this issue.
+    placeholder: Describing the expected vs. the current behavior will help us direct this issue to the correct working group for investigation.
   validations:
     required: true
 - type: textarea
   id: repro_steps
   attributes:
     label: Reproduction Steps
     description: Provide step-by-step instructions for reproducing the issue.
-    placeholder: Please provide a public URL and ideally a reduced test case that exhibits only your issue and nothing else.
+    placeholder: Please provide a public URL and ideally a reduced test case that clearly demonstrates your issue.
   validations:
     required: true
 - type: textarea
   id: logs
   attributes:
     label: Relevant Logs
     description: Optionally paste any relevant log output here.
-    placeholder: Paste plain-text logs here (e.g. console warnings or errors from Chrome DevTools). They will automatically be formatted as code.
+    placeholder: Paste any plain-text logs here (e.g. console warnings or errors from Chrome DevTools). They will automatically be formatted as code.
     render: shell
 - type: dropdown
   id: browsers