Fold the date filter notes into their own option entries

#638 documented --registered and --last_updated as options in their own
right, which left them described twice after the merge: once here and once
in the --<field>=<value> blurb. Keep the dedicated entries and drop the
duplicate.

The <yyyy-mm-dd-hh-ii-ss> placeholder those entries inherited also implied
a full timestamp was required, which stopped being true once the filters
became a date query, so they take <date> now.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014SSZzqMJRDTiLiDxQEPYcL

Author: claude

README.md

@@ -5342,7 +5342,7 @@ These fields are optionally available:
 Lists all sites in a multisite installation.
 
 ~~~
-wp site list [--network=<id>] [--<field>=<value>] [--site__in=<value>] [--site_user=<value>] [--site-path=<path>] [--blog_id=<blog_id>] [--site_id=<site_id>] [--domain=<domain>] [--registered=<yyyy-mm-dd-hh-ii-ss>] [--last_updated=<yyyy-mm-dd-hh-ii-ss>] [--public=<public>] [--archived=<archived>] [--mature=<mature>] [--spam=<spam>] [--deleted=<deleted>] [--lang_id=<lang_id>] [--field=<field>] [--fields=<fields>] [--format=<format>]
+wp site list [--network=<id>] [--<field>=<value>] [--site__in=<value>] [--site_user=<value>] [--site-path=<path>] [--blog_id=<blog_id>] [--site_id=<site_id>] [--domain=<domain>] [--registered=<date>] [--last_updated=<date>] [--public=<public>] [--archived=<archived>] [--mature=<mature>] [--spam=<spam>] [--deleted=<deleted>] [--lang_id=<lang_id>] [--field=<field>] [--fields=<fields>] [--format=<format>]
 ~~~
 
 **OPTIONS**
@@ -5355,8 +5355,6 @@ wp site list [--network=<id>] [--<field>=<value>] [--site__in=<value>] [--site_u
 		other argument accepted by WP_Site_Query, such as 'search', 'site__not_in',
 		'number', 'offset', 'orderby' or 'order'. However, 'url' isn't an available
 		filter, as it comes from 'home' in wp_options.
-		'--registered' and '--last_updated' take a timestamp or a date; a value
-		carrying no time of day matches that whole day.
 		Note: '--path' conflicts with the global parameter of the same name; use
 		'--site-path' to filter by path instead.
 
@@ -5379,11 +5377,13 @@ wp site list [--network=<id>] [--<field>=<value>] [--site__in=<value>] [--site_u
 	[--domain=<domain>]
 		Filter by domain.
 
-	[--registered=<yyyy-mm-dd-hh-ii-ss>]
-		Filter by the date the site was registered.
+	[--registered=<date>]
+		Filter by the date the site was registered. Accepts a timestamp or a
+		date; a value carrying no time of day matches that whole day.
 
-	[--last_updated=<yyyy-mm-dd-hh-ii-ss>]
-		Filter by the date the site was last updated.
+	[--last_updated=<date>]
+		Filter by the date the site was last updated. Accepts a timestamp or a
+		date; a value carrying no time of day matches that whole day.
 
 	[--public=<public>]
 		Filter by whether the site is public. Accepts 1 or 0.

src/Site_Command.php

@@ -990,8 +990,6 @@ private function get_network( $network_id ) {
 	 * other argument accepted by WP_Site_Query, such as 'search', 'site__not_in',
 	 * 'number', 'offset', 'orderby' or 'order'. However, 'url' isn't an available
 	 * filter, as it comes from 'home' in wp_options.
-	 * '--registered' and '--last_updated' take a timestamp or a date; a value
-	 * carrying no time of day matches that whole day.
 	 * Note: '--path' conflicts with the global parameter of the same name; use
 	 * '--site-path' to filter by path instead.
 	 *
@@ -1014,11 +1012,13 @@ private function get_network( $network_id ) {
 	 * [--domain=<domain>]
 	 * : Filter by domain.
 	 *
-	 * [--registered=<yyyy-mm-dd-hh-ii-ss>]
-	 * : Filter by the date the site was registered.
+	 * [--registered=<date>]
+	 * : Filter by the date the site was registered. Accepts a timestamp or a
+	 * date; a value carrying no time of day matches that whole day.
 	 *
-	 * [--last_updated=<yyyy-mm-dd-hh-ii-ss>]
-	 * : Filter by the date the site was last updated.
+	 * [--last_updated=<date>]
+	 * : Filter by the date the site was last updated. Accepts a timestamp or a
+	 * date; a value carrying no time of day matches that whole day.
 	 *
 	 * [--public=<public>]
 	 * : Filter by whether the site is public. Accepts 1 or 0.