docs: simplify PULL_REQUEST_TEMPLATE by removing summary and details sections

Author: paul58914080

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,17 +1,8 @@
-## Summary
-
-<!-- Provide a general summary description of your changes -->
-
-## Details
-
-<!-- Describe your changes in detail -->
-
 ## Context
 
 <!-- Why is this change required? What problem does it solve? -->
-<!-- Which environnment is/are impacted ? -->
 
-## Checklist:
+## Checklist
 
 <!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
 <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
@@ -20,5 +11,5 @@
 - [ ] Documentation has been updated accordingly to this PR
 
 
-## Related issue : 
+## Related issue
 <!-- If it fixes an open issue, please link to the issue here. -->