Document caveats of `pointer-events: none` usage in btn.disabled
Document caveats of `pointer-events: none` usage in btn.disabled

BS3 commits: 00b3b8b0b8d5515b6eb1ea7064f6d88175306ed9

2947721120/googlebt4,todc/todc-bootstrap,aaroncnhk/todc-bootstrap,mozillo/todc-bootstrap,up2vs/todc-bootstrap,todc/todc-bootstrap,todc/todc-bootstrap,2947721120/todc-bootstrap,ztx1491/todc-bootstrap