Add heading hierarchy checker notice#14889

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Jackie6 wants to merge 6 commits intoWordPress:masterfrom Jackie6:add/heading-checker

+109-1

Commits on Apr 8, 2019

Add headings hierarchy checker notice
Jackie6
committed

Commits on Apr 9, 2019

Remove duplicate function and use import instead
Jackie6
committed

Commits on Apr 11, 2019

Commits on Apr 15, 2019

Add checking for duplicate headings
Jackie6
committed