Fix coding conventions PR template (#905)

### Description
Fix coding conventions PR template

### Checklist
- [x] Code compiles correctly
- [x] Code is formatted according to [Coding
Conventions](../CodingConventions.md)
- [x] Created tests which fail without the change (if possible)
- [x] All tests passing (`dotnet test`)
- [x] Extended the README / documentation, if necessary
- [x] Provide JIRA issue id (if possible) or GitHub issue id in PR name

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,8 +3,8 @@ Please explain the changes you made here.
 
 ### Checklist
 - [ ] Code compiles correctly
-- [ ] Code is formatted according to [Coding Conventions](../CodingConventions.md)
+- [ ] Code is formatted according to [Coding Conventions](../blob/master/CodingConventions.md)
 - [ ] Created tests which fail without the change (if possible)
 - [ ] All tests passing (`dotnet test`)
 - [ ] Extended the README / documentation, if necessary
-- [ ] Provide JIRA issue id (if possible) or GitHub issue id in PR name
+- [ ] Provide JIRA issue id (if possible) or GitHub issue id in PR name