Update DEVELOPER_GUIDE.md

Co-authored-by: Miki <[email protected]>
Signed-off-by: Kawika Avilla <[email protected]>

DEVELOPER_GUIDE.md

@@ -294,7 +294,7 @@ Then within another window. You can start:
 Or with non-default values:
 
 > 1. Run `export OPENSEARCH_USERNAME=admin`
-> 2. Run `export OPENSEARCH_PASSWORD=<inital admin password>`
+> 2. Run `export OPENSEARCH_PASSWORD=<initial admin password>`
 > 3. Optional: Run `export OPENSEARCH_SECURITY_READONLY_ROLE=<read only role>`
 > 4. Run `yarn start:security`
 > 5. Navigate to OpenSearch Dashboards and login with the above username and password.