Fix var types of parameters in `sanitize_option_{$option}` filter

[crstauf]

The documentation is defining $value and $original_value as if they were of type string, but they are very often of type array.

Reported by @gerardreches via User Contributed Notes.

Fixes the documentation of the parameters used in sanitize_option_{$option} filter.

Reported by gerardreches via User Contributed Notes.

Trac ticket: https://core.trac.wordpress.org/ticket/60214

[audrasjb]

Thanks for the ticket! Self assigning for review.

[audrasjb]

Using mixed looks good to me since the value can be anything: worth not listing all possible types here.
Moving for 6.5 consideration.

@crstauf left one minor question for clarification. Thanks!

left one minor question for clarification. Thanks!

@mukeshpanchal27 Done. Thanks.

[audrasjb]

In 57302:

Docs: Fix var types of parameters in sanitize_option() and sanitize_option_{$option}.

The related docblocks were previously defining $value and $original_value as if they were of type string, but they can also be of other types, like array.

Props gerardreches, crstauf, mukesh27.
Fixes #60214.
See #59651.

Committed in https://core.trac.wordpress.org/changeset/57302