Docs: Remove erroneous @static notation from WP_Tax_Query::get_sql(), added in [32627].

The method was never used as static.

Props birgire.
See #42803.

git-svn-id: https://develop.svn.wordpress.org/trunk@42752 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -234,8 +234,6 @@ class WP_Tax_Query {
 	 *
 	 * @since 3.1.0
 	 *
-	 * @static
-	 *
 	 * @param string $primary_table     Database table where the object being filtered is stored (eg wp_users).
 	 * @param string $primary_id_column ID column for the filtered object in $primary_table.
 	 * @return array {