[Bugfix:Sysadmin Documentation] Fix psql to import DB (Submitty#170)

Fixed File not found error

Author: PandaWhoCodes

_docs/sysadmin/database_overview.md

@@ -43,8 +43,8 @@ to start over, you would need to do:
 ```
 sudo su postgres
 psql -c "CREATE DATABASE submitty;"
-psql -d submitty -f /usr/local/submitty/GIT_CHECKOUT/Submitty/migration/data/submitty_db.sql
+psql -d submitty -f /usr/local/submitty/GIT_CHECKOUT/Submitty/migration/migrator/data/submitty_db.sql
 psql -d submitty -c "alter schema public owner to submitty_dbuser;"
 ```
 
-Then, continue setup by following the [Course Creation](course_creation) instructions.
+Then, continue setup by following the [Course Creation](course_creation) instructions.