DOC: Fixed typo.

RELEASE_GUIDELINES.md

@@ -21,7 +21,7 @@ guidelines of the CaosDB Project
 3. Check all general prerequisites.
 
 4. Update the version:
-   - `version` variables in `docs/conf.py`
+   - `version` variables in `src/doc/conf.py`
    - Version on [setup.py](./setup.py): Check the `MAJOR`, `MINOR`, `MICRO`, `PRE` variables and set
      `ISRELEASED` to `True`. Use the possibility to issue pre-release versions for testing.