replace SemVer summary with a link to its website; fixes #13650

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set not-allowed cursor on disabled radio+checkbox labels; fixes #13281

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add docs for #13745

Good catch @juthilo
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Merge pull request #13744 from twbs/fix-13650

replace SemVer summary with a link to its website
fixes #13210: clean up tooltip example
Merge pull request #13745 from twbs/fix-13281

set not-allowed cursor on disabled radio+checkbox labels