updated GitHub template (#2251)

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,17 +1,12 @@
 ## Description of the issue/feature this PR addresses
 
-https://jira.bikalabs.com/browse/LIMS-XXX
-https://github.com/bikalabs/bika.lims/issues/
-
+Linked issue: https://github.com/bikalims/bika.lims/issues/
 
 ## Current behavior before PR
 
 ## Desired behavior after PR is merged
 
 --
-I confirm I have read the [Bika LIMS Developer Guidelines][1] and that I have
-tested the PR thoroughly and coded it according to [PEP8][2] standards.
-
-[1]: https://github.com/bikalabs/bika.lims/wiki/Bika-LIMS-Developer-Guidelines
+I confirm I have tested this PR thoroughly and coded it according to [PEP8][1] standards.
 
-[2]: https://www.python.org/dev/peps/pep-0008
+[1]: https://www.python.org/dev/peps/pep-0008