docs: update PR template (#780)

Remove IE11 check from github PR template

.github/pull_request_template.md

@@ -9,6 +9,6 @@ If it involves visual changes include a screenshot or gif.
 Delete any items that are not applicable to this PR.
 
 - [ ] Any consumer-facing exports were added to `src/index.ts` (and stories only import from `../src` except for test data & storybook)
-- [ ] This was checked for cross-browser compatibility, [including a check against IE11](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility)
+- [ ] This was checked for cross-browser compatibility
 - [ ] Proper documentation or storybook story was added for features that require explanation or tutorials
 - [ ] Unit tests were updated or added to match the most common scenarios