Docs: Fix typo in WP_Date_Query::build_mysql_datetime() DocBlock.

Follow-up to [25139].

Props nithi22, benniledl, mukesh27.
Fixes #60067.

git-svn-id: https://develop.svn.wordpress.org/trunk@57189 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-date-query.php

@@ -866,7 +866,7 @@ public function build_value( $compare, $value ) {
 	 *
 	 * @since 3.7.0
 	 *
-	 * @param string|array $datetime       An array of parameters or a strotime() string.
+	 * @param string|array $datetime       An array of parameters or a strtotime() string.
 	 * @param bool         $default_to_max Whether to round up incomplete dates. Supported by values
 	 *                                     of $datetime that are arrays, or string values that are a
 	 *                                     subset of MySQL date format ('Y', 'Y-m', 'Y-m-d', 'Y-m-d H:i').