docs(gh): try to improve the issue template (angular#11891)

Author: vicb

.github/ISSUE_TEMPLATE.md

@@ -1,31 +1,39 @@
+<!--
+IF YOU DON'T FILL OUT THE FOLLOWING INFORMATION WE MIGHT CLOSE YOUR ISSUE WITHOUT INVESTIGATING
+-->
+
 **I'm submitting a ...**  (check one with "x")
 ```
 [ ] bug report => search github for a similar issue or PR before submitting
 [ ] feature request
 [ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
 ```
 
-**Current behavior** 
+**Current behavior**
 <!-- Describe how the bug manifests. -->
 
 **Expected behavior**
 <!-- Describe what the behavior would be without the bug. -->
 
-**Reproduction of the problem**
-<!-- If the current behavior is a bug or you can illustrate your feature request better with an example, please provide the steps to reproduce and if possible a minimal demo of the problem via https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:AvJOMERrnz94ekVua0u5). -->
+**Minimal reproduction of the problem with instructions**
+<!--
+If the current behavior is a bug or you can illustrate your feature request better with an example, 
+please provide the *STEPS TO REPRODUCE* and if possible a *MINIMAL DEMO* of the problem via
+https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:AvJOMERrnz94ekVua0u5).
+-->
 
 **What is the motivation / use case for changing the behavior?**
 <!-- Describe the motivation or the concrete use case -->
 
 **Please tell us about your environment:**
 <!-- Operating system, IDE, package manager, HTTP server, ... -->
 
-* **Angular version:** 2.0.X 
+* **Angular version:** 2.0.X
 <!-- Check whether this is still an issue in the most recent Angular version -->
 
-* **Browser:** [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ] 
+* **Browser:** [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
 <!-- All browsers where this could be reproduced -->
 
 * **Language:** [all | TypeScript X.X | ES6/7 | ES5]
- 
+
 * **Node (for AoT issues):** `node --version` =