[docs] a symbol cannot be an unstropped keyword

[AmjadHD]

[timotheecour]

use text, not images (impossible to search images on github)

[Araq]

Bug in the spec.

[AmjadHD]

Just a note KEYW is not explicitly defined in the manual, at least add a note that KEYW denotes the list of reserved keywords. It's not clear whether it includes operators like div for example.

[metagn]

Related, but probably doesn't need it's own issue

breakStmt = 'break' optInd expr?
continueStmt = 'break' optInd expr?

Second one should be 'continue'. expr? is correct.

[AmjadHD]

does COMMENT mean only block comments ?

colcom = ':' COMMENT?
blockExpr = 'block' symbol? colcom stmt

block comment:

let a = block: #[Works]# 1

line comment:

let a = block: # Indentation Error
1

[metagn]

This was fixed in #21655