docs: fixed sql to query in the last example (#5753)

there was no `sql` tag in the example, and `query` made the most sense.

docs/logging.md

@@ -162,6 +162,6 @@ postRepository.save(post, { data: { request: request } });
 // in logger you can access it this way:
 logQuery(query: string, parameters?: any[], queryRunner?: QueryRunner) {
     const requestUrl = queryRunner && queryRunner.data["request"] ? "(" + queryRunner.data["request"].url + ") " : "";
-    console.log(requestUrl + "executing query: " + sql);
+    console.log(requestUrl + "executing query: " + query);
 }
 ```