Small grammar fix.

* Explore responsive display utils, but with a twist: lowest breakpoint has no breakpoint modifier in the class name
* make floats use the same format, add float-none mixin

It was only available for anchor elements and not button elements, so it was super weird to support. Might be bringing it back with flexbox though in v4 as an option.

* Fixes #19796: Remove mention of tooltip auto placement

* add note to migration docs

To be prefixed with `.table-`.

In about 'Reboot', it says "moving **from** `rem` **to** `em` units. It should be moving from `em` to `rem`.

Changed `box-sizing: border` to `box-sizing: border-box`

Fixes #18813
Closes #20187

[skip sauce]

[ci skip]

The `remote` option and the accompanying event have been removed.

Update tags/labels/badges migration docs to mention class and change in behavior for alignment in list groups

Fixes #18705: Clarify removal of .help-text and update changes to .form-group for horizontal layouts

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>

Closes #19561
Closes #19567
[skip sauce]

[skip sauce]

Refs #19080