Update CODING_STANDARDS for the acronym casing RFC

[TimWolla]

see https://wiki.php.net/rfc/class-naming-acronyms

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/cc @Crell

[nielsdos]

I'm not the ideal person to reviewing policy text, but I think this is good.

[Crell]

I think this looks reasonable aside from the one formatting note. Once it's merged I'll see about getting PER-CS updated to match.

[Girgias]

Other than Larry's remark LGTM.

Maybe @derickr wants to review this too?

[TimWolla]

Maybe derickr wants to review this too?

The adjustments I made were directly taken from the RFC text itself (i.e. the phrasing was voted on). I just wanted the second pair of eyes to check whether I professionally copy and pasted the stuff and whether formatting is good.

[derickr]

Ideally, we don't have this in two places any more. I would be in favour of removing this now, and pointing to https://github.com/php/policies/blob/main/coding-standards-and-naming.rst

[TimWolla]

I would be in favour of removing this now, and pointing to https://github.com/php/policies/blob/main/coding-standards-and-naming.rst

@derickr I agree, but the CODING_STANDARDS.md contains more instructions than the coding-standards-and-naming.rst. An experienced technical writer would need to correctly merge those. I'm not the right person for that.