Update links in markdown files

.github/PULL_REQUEST_TEMPLATE.md

@@ -31,4 +31,4 @@ Describe any non-bug related behavioral changes that may change how users app be
 - [ ] Has samples (if omitted, state reason in description)
 - [ ] Rebased on top of master at time of PR
 - [ ] Changes adhere to coding standard
-- [ ] Updated documentation ([see walkthrough](https://github.com/xamarin/Xamarin.Essentials/wiki/Documenting-your-code-with-mdoc))
+- [ ] Updated documentation ([see walkthrough](https://github.com/xamarin/Essentials/wiki/Documenting-your-code-with-mdoc))

SUBMITTING-ISSUES.md

@@ -1,4 +1,4 @@
-If you think you've found a bug to report, before doing anything else you should check the [Issues](https://github.com/xamarin/Xamarin.Essentials/issues) page to see if an issue has already been filed! This can help reduce the number of duplicate reports.
+If you think you've found a bug to report, before doing anything else you should check the [Issues](https://github.com/xamarin/Essentials/issues) page to see if an issue has already been filed! This can help reduce the number of duplicate reports.
 
 If you're ready to submit a new issue, taking the following steps helps expedite the bug triage process: