Docs & Comments & Updates styles for EuiScreenReaderOnly#2

Merged

cee-chen merged 4 commits intocee-chen:screen-reader-only-clipfrom

cchaos:screen-reader-only-clip

Sep 10, 2021

Commits on Sep 8, 2021

[Docs] Updated Accessiblity Utility pages with more nuances about EuiScreenReaderOnly
cchaos
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Remove `euiScreenReaderOnly` mixin from checkbox and radio styles in favor of always having the input
cchaos
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Commented Sass
cchaos
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[EuiLink] Position relative if `target=_blank` for positioning screen reader text
cchaos
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