Update proxysql_query_rules.py (#43877)

<!--- Your description here -->

+label: docsite_pr

lib/ansible/modules/database/proxysql/proxysql_query_rules.py

@@ -148,10 +148,11 @@ EXAMPLES = '''
 # single batch using the M(proxysql_manage_config) module). It uses supplied
 # credentials to connect to the proxysql admin interface.
 
-- proxysql_backend_servers:
+- proxysql_query_rules:
     login_user: admin
     login_password: admin
     username: 'guest_ro'
+    match_pattern: "^SELECT.*"
     destination_hostgroup: 1
     active: 1
     retries: 3
@@ -163,7 +164,7 @@ EXAMPLES = '''
 # config to runtime.  It uses credentials in a supplied config file to connect
 # to the proxysql admin interface.
 
-- proxysql_backend_servers:
+- proxysql_query_rules:
     config_file: '~/proxysql.cnf'
     username: 'guest_ro'
     state: absent