Fix var types of parameters in sanitize_option() and sanitize_option_{$option} filter

[crstauf]

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

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[github-actions]

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[mukeshpanchal27]

@crstauf left one minor question for clarification. Thanks!

[crstauf]

left one minor question for clarification. Thanks!

@mukeshpanchal27 Done. Thanks.

[audrasjb]

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