minimums:
  chrome: 67
  safari: 11
  firefox: 68
  ie: 12

minimums:
  chrome: 76
  safari: 11
  firefox: 68
  ie: 12

Update minimum Chrome version to 76
Update minimum Chrome version to 76

Current version of Chrome is 78; Firefox is 70

CLOSES: DOC-1154

Test plan:
- specs pass

Change-Id: I29466e7fe5ae0908fa11a54788d0537658bb9a8c
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/218451
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Tested-by: Jenkins
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
QA-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Product-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
