Docblock improvements for 5.0

[johnbillion]

Previously:

• #41017 (4.9)
• #39130 (4.8)
• #37770 (4.7)
• #32246 (4.6)

In 42143:

Docs: Improve inline docs for the wp_redirect() and wp_safe_redirect() functions.

See #42505, #42108

In 42151:

Docs: Correct parameter type documentation for various __call() methods.

See #42505

@afercia in #42530:

• ...seems to me all the new functions introduced in [41630] miss a @since notation in their docblocks.
• Additional note about documentation standards: many multiline inline comments introduced in [41630] use a double asterisk, e.g.:

  /**
   * If the selection is on a shortcode with Live View, TinyMCE creates a bogus markup,
   * which we have to account for.
   */
  

• Note: one more coding standard that isn't met across [41630]: ​Declaring Variables With var
  • Each function should begin with a single comma-delimited var statement that declares any local variables necessary