Updating the templates to minimize checkboxes and use HTML comments. (#1394)

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,12 @@
-Thanks for submitting code to Blockly!  Please fill out the following as part of your pull request so we can review your code more easily.
+<!--
+  - Thanks for submitting code to Blockly!  Please fill out the following as part of
+  - your pull request so we can review your code more easily.
+  -->
 
 ## The basics
 
+<!-- TODO: Verify the following, checking each box with an 'x' between the brackets: [x] -->
+
 - [ ] I branched from develop
 - [ ] My pull request is against develop
 - [ ] My code follows the [style guide](https://developers.google.com/blockly/guides/modify/web/style-guide)
@@ -9,37 +14,40 @@ Thanks for submitting code to Blockly!  Please fill out the following as part of
 ## The details
 ### Resolves
 
-_What Github issue does this resolve (please include link)?_
+<!-- TODO: What Github issue does this resolve? Please include a link. -->
 
 ### Proposed Changes
 
-_Describe what this Pull Request does.  Include screenshots if applicable._
+<!-- TODO: Describe what this Pull Request does.  Include screenshots if applicable. -->
 
 ### Reason for Changes
 
-_Explain why these changes should be made.  Include screenshots if applicable._
+<!--TODO: Explain why these changes should be made.  Include screenshots if applicable. -->
 
 ### Test Coverage
 
-_Please show how you have added tests to cover your changes, or tell us how you tested it and on which platforms._
+<!-- TODO: Please show how you have added tests to cover your changes,
+  -        or tell us how you tested it. For each systems you tested,
+  -        uncomment the systems in the list below.
+  -->
 
 Tested on:
-_Remove this hint: these checkboxes can be checked like this: [x]_
-- [ ] Desktop:
-  - [ ] Chrome
-  - [ ] Firefox
-  - [ ] Safari
-  - [ ] Opera
-  - [ ] IE 10+
-  - [ ] IE 11
-  - [ ] EDGE
+<!-- * Desktop Chrome -->
+<!-- * Desktop Firefox -->
+<!-- * Desktop Safari -->
+<!-- * Desktop Opera -->
+<!-- * Windows Internet Explorer 10 -->
+<!-- * Windows Internet Explorer 11 -->
+<!-- * Windows Edge -->
+
+<!--
+* Smartphone/Tablet/Chromebook (please complete the following information):
+  * Device: [e.g. iPhone6]
+  * OS: [e.g. iOS8.1]
+  * Browser [e.g. stock browser, safari]
+  * Version [e.g. 22]
+-->
 
-- [ ] Smartphone/Tablet/Chromebook (please complete the following information):
-  - Device: [e.g. iPhone6]
-  - OS: [e.g. iOS8.1]
-  - Browser [e.g. stock browser, safari]
-  - Version [e.g. 22]
-  
 ### Additional Information
 
-_Anything else we should know?_
+<!-- Anything else we should know? -->