(docs) Non-minified files are UTF-8, minified are ASCII

[joshgoebel]

I'd like to note that ascii_only: true is a terser-only option, so the non-minified files may contain arbitrary UTF-8 chars.

Originally posted by @aduh95 in #3209 (comment)

---

We may need to take some action on this knowledge...

[joshgoebel]

% file build/highlight.min.js                                                                             
build/highlight.min.js: ASCII text, with very long lines
% file build/highlight.js                                                                                   
build/highlight.js: UTF-8 Unicode text, with very long lines

Confirm. Since this:

• hasn't been an actual issue for anyone (people are using minified, as they should)
• Can be resolved with the HTML attribute charset
• UTF-8 is the future
• Web servers should also be providing this via HTTP headers

... I'm declaring the existing behavior correct and this should be a docfix if at all.

The minified file is provided ASCII only for convenience. The non-minified file is intentional UTF-8.