CLDR-18028 Fix final items in spec before release

[macchiati]

CLDR-18028

Includes

• Updates to the terms of use and status for each section.
• Deletion of some outdated notes in summaries (eg, "some links may lead to in-development ...")
• In tr35.md, also:
  • reworded the explanation of the relationship between Unicode BCP 47 locale identifier and_BCP 47 language tag_, also adding 2 links for more information
  • fixed typos

This does not do the final adjustments before release:

• changing |Version|46 (draft) | to |Version|46 |

• Hiding _This is a draft document… and unhiding _This document has been…

• Fixing the TOC

• This PR completes the ticket.

ALLOW_MANY_COMMITS=true

[srl295]

LGTM did we already mark it as stable?

[macchiati]

Mark "it" as stable?

BTW, this is the first of several commits; this part is mostly updating the TOU, but there are other items from the TC meeting. I also left a question in slack.

[AEApple]

I still don't see the fix for the mispelling of 'useage' in the modifications section. I haven't finished checking the others yet. Are all the edits from the TC meeting about the mods section expected to be included in this PR?

[macchiati]

This is still draft, so I don't have all the fixes in from the meeting yet. Once I do I'll mark it as 'ready for review'.

[macchiati]

Just made "Ready for review". Added notes in the Description for what was done.

I'll leave the ticket open for the later work, but we can merge this PR.

[macchiati]

Note: for some reason the Rich Text button fails, with:

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