Fix 'occured' -> 'occurred' typo in mysql databases_data error log (DataDog#23336)

Two error log messages in mysql/datadog_checks/mysql/databases_data.py
read 'the following exception occured {}'. Both are emitted from the
fetch-database-data path and are user-visible in mysql check error
output. ast.parse stays clean.

Co-authored-by: SAY-5 <saiasish.cnp@gmail.com>

Author: SAY-5

mysql/datadog_checks/mysql/databases_data.py

@@ -275,14 +275,14 @@ def _fetch_for_databases(self, db_infos, cursor):
                 self._fetch_database_data(cursor, start_time, db_info['name'])
             except StopIteration as e:
                 self._log.error(
-                    "While executing fetch database data for database {}, the following exception occured {}".format(
+                    "While executing fetch database data for database {}, the following exception occurred {}".format(
                         db_info['name'], e
                     )
                 )
                 return
             except Exception as e:
                 self._log.error(
-                    "While executing fetch database data for database {}, the following exception occured {}".format(
+                    "While executing fetch database data for database {}, the following exception occurred {}".format(
                         db_info['name'], e
                     )
                 )