Update PR & Issue Template (#8555)

* Update PULL_REQUEST_TEMPLATE.md

* Update ISSUE_TEMPLATE.md

* Update PULL_REQUEST_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

@@ -1,6 +1,6 @@
-Note: Providing complete information in the most concise form is the best way to get help. This issue template serves as the checklist for essential information to most of the technical issues.
+Note: Providing complete information in the most concise form is the best way to get help. This issue template serves as the checklist for essential information to most of the technical issues and bug reports. For non-technical issues and feature requests, feel free to present the information in what you believe is the best form.
 
-If the issue is non-technical, feel free to present the information in what you believe is the best form.
+For Q & A and discussion, please start a discussion thread at https://discuss.mxnet.io 
 
 ## Description
 (Brief description of the problem in no more than 2 sentences.)

.github/PULL_REQUEST_TEMPLATE.md

@@ -6,7 +6,7 @@
 - [ ] Passed code style checking (`make lint`)
 - [ ] Changes are complete (i.e. I finished coding on this PR)
 - [ ] All changes have test coverage
-- [ ] For user-facing API changes, API doc string has been updated.
+- [ ] For user-facing API changes, API doc string has been updated. For new C++ functions in header files, their functionalities and arguments are well-documented. 
 - [ ] To my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
 
 ### Changes ###
@@ -15,4 +15,4 @@
 
 ## Comments ##
 - If this change is a backward incompatible change, why must this change be made.
-- Intersting edge cases to note here
+- Interesting edge cases to note here