removed unnescessary text

Author: feyruzb

docs/web/db_schema_guide.md

@@ -38,7 +38,6 @@ Edit the `sqlalchemy.url` option in
 according to your database configuration.
 
 ### **Step 3**: Use alembic to autogenerate migration scripts
-Change username and path to your CodeChecker installation.
 
 `PYTHONPATH=<codechecker_root>/build/CodeChecker/lib/python3 alembic --name config_db revision --autogenerate -m "Change description"`