For #15561: add comments to issue template (#15690)

* For #15561: add comments to feature template

Comments are copied directly from https://github.com/mozilla-mobile/fenix#i-want-to-file-an-issue for more information

* For #15561: add comments to bug template

Comments are copied directly from https://github.com/mozilla-mobile/fenix#i-want-to-file-an-issue

* Move comments above STR and change message

* Move comments above "What is the user problem"

.github/ISSUE_TEMPLATE/---bug-report.md

@@ -6,6 +6,9 @@ labels: "\U0001F41E bug"
 assignees: ''
 
 ---
+[comment]: # (Please do your best to search for duplicate issues before filing a new issue so we can keep our issue board clean)
+[comment]: # (Every issue should have the exact bug and steps to reproduce described in it. Please do not file feedback list tickets as it is difficult to parse them and address their individual points)
+[comment]: # (Read https://github.com/mozilla-mobile/fenix#i-want-to-file-an-issue for more information)
 
 ## Steps to reproduce
 
@@ -17,3 +20,4 @@ assignees: ''
 
 * Android device: ?
 * Fenix version: ?
+ 

.github/ISSUE_TEMPLATE/---feature-request.md

@@ -6,6 +6,10 @@ labels: "🌟 feature request"
 assignees: ''
 
 ---
+[comment]: # (Please do your best to search for duplicate issues before filing a new issue so we can keep our issue board clean)
+[comment]: # (Every issue should have exactly one feature request described in it. Please do not file feedback list tickets as it is difficult to parse them and address their individual points)
+[comment]: # (Feature Requests are better when they’re open-ended instead of demanding a specific solution e.g: “I want an easier way to do X” instead of “add Y”)
+[comment]: # (Read https://github.com/mozilla-mobile/fenix#i-want-to-file-an-issue for more information)
 
 ### What is the user problem or growth opportunity you want to see solved?