message: Fix typo in pyathena connection string
diff: @@ -31,5 +31,5 @@ You can also use [PyAthena library](https://pypi.org/project/PyAthena/) (no Java
  following connection string:
  ```
  -awsathena+rest://{aws_access_key_id}:{aws_secret_access_key}@athena.{region_name}.amazonaws.com/{
  +awsathena+rest://{aws_access_key_id}:{aws_secret_access_key}@athena.{region_name}.amazonaws.com/{schema_name}?s3_staging_dir={s3_staging_dir}&...
  ```
  