questions/qa-bidi-unicode-controls: bidi marks are not control characters

[3052]

this page:

https://w3.org/International/questions/qa-bidi-unicode-controls

sourced here:

https://github.com/w3c/i18n-drafts/blob/gh-pages/questions/qa-bidi-unicode-controls.en.html

contains:

Unicode provides two other invisible directional control characters.
Character   Name    Code point  Equivalent markup   Comment
LRM     LEFT-TO-RIGHT MARK  U+200E  none    strongly typed LTR character
RLM     RIGHT-TO-LEFT MARK  U+200F  none    strongly typed RTL character

but these aren't control characters. according to the same website in multiple locations, they are "General Punctuation":

• https://w3.org/International/Spread/punctuation.txt
• https://w3.org/TR/WD-html40-970708/sgml/entities.html

[xfq]

These characters are not punctuation, they're just in the "General Punctuation" block. General Punctuation is a Unicode block containing punctuation, spacing, and formatting characters.

Unicode provides two other invisible directional control characters.

They are "directional control" characters, instead of directional "control characters".

Since Unicode calls them "format characters", we can change the text to something like:

Unicode provides two other invisible format characters related to direction.

[3052]

Unicode provides two other invisible format characters related to direction.

thats an improvement, so sounds good