[css-page-floats-3][css-box-3] Move definitions of float and clear

[cdoublev]

both, both-inline, both-block, are not included in the value of the definition table for the clear property in CSS Page Floats 3, which is currently the primary value definition for clear, but are defined in prose below the clear definition table.

EDIT

According to this comment, clear and float should be defined in CSS Box 3 (or a module for block layout) therefore I change my demand by updating the title of this issue, and by asking for the following changes in CSS Page Floats 3 (after defining float and clear in another spec):

  Name: `float`
- Value: `block-start | block-end | inline-start | inline-end | snap-block | <snap-block()> | snap-inline | <snap-inline()> | left | right | top | bottom | none`
+ New values: `block-start | block-end | inline-start | inline-end | snap-block | <snap-block()> | snap-inline | <snap-inline()> | top | bottom`

  Name: `clear`
- Value: `inline-start | inline-end | block-start | block-end | left | right | top | bottom | none`
+ New values: `inline-start | inline-end | block-start | block-end | top | bottom`

[fantasai]

Fixed in #9105

CSS Block Layout Level 3 is still a pipe dream, so closing this out for now. :)