Sergey Biryukov 6787d4d602 Twenty Nineteen: Improve menu semantics and keyboard navigation.
The menu's original markup included some non-semantic tags and an unnecessary tabindex attribute that made it difficult to navigate via keyboard. 

Props allancole, anevins, kjellr.
Merges [44376] to the 5.0 branch.
Fixes #45713.
Built from https://develop.svn.wordpress.org/branches/5.0@44426


git-svn-id: http://core.svn.wordpress.org/branches/5.0@44256 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-01-07 16:00:46 +00:00
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