PHPDocs for options_reading_blog_charset()

[SergeyBiryukov]

Background: #21507

[SergeyBiryukov]

Refreshed after [21856]

[nacin]

In [21872]:

Docs for options_reading_blog_charset(). props SergeyBiryukov, fixes #21886.

[SergeyBiryukov]

add_js() was originally added in 3.1: [15946] (for #15205). Was the change to 3.5 in the commit intentional?

21886.3.patch​ adds @since for other *_add_js() functions.

Not sure if @package and @subpackage are relevant for those functions. The patch removes them for consistency with [21872].

[nacin]

@package and @subpackage are rarely relevant for functions at all. Since we renamed add_js(), I changed the @since to when it was actually introduced. Normally we'd also include some info about when it was originally introduced (before rename), but this is just a formality, as these are internal functions anyway.

[SergeyBiryukov]

I see. 21886.4.patch​ adds @since 3.5.0 for other renamed functions.

[nacin]

In [21994]:

@since for some internal functions. props SergeyBiryukov, fixes #21886.