[ENSCORESW-2820] Update links in pull request template

Created by: ens-bwalts

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion;
• Review the contributing guidelines for this repository; remember in particular:
  • do not modify code without testing for regression
  • provide simple unit tests to test the changes
  • if you change the schema you must patch the test databases as well, see Updating the schema
  • the PR must not fail unit testing

Description

Update links in the pull request template to point to documents in the master branch

Use case

Links were pointing to documents in release/90, making it difficult to update supporting documentation referenced in the PR template

Benefits

Makes our developer documentation easier to maintain. Contributors have access to the most up to date contribution guidelines

Possible Drawbacks

None

Testing

Verified that links direct to the correct page

If so, do the tests pass/fail?

Pass

Have you run the entire test suite and no regression was detected?

Yes