Grafana example readme update (nv-morpheus#1393)

- Remove step to log in to Grafana dashboard since example was updated to not require it anymore. 

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/nv-morpheus/Morpheus/blob/main/docs/source/developer_guide/contributing.md).
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Eli Fajardo (https://github.com/efajardo-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: nv-morpheus#1393

examples/digital_fingerprinting/production/grafana/README.md

@@ -96,8 +96,6 @@ docker compose up grafana
 
 Our Grafana DFP dashboard can now be accessed via web browser at http://localhost:3000/dashboards.
 
-Log in with admin/admin.
-
 Click on `DFP_Dashboard` in the `General` folder. You may need to expand the `General` folder to see the link.
 
 <img src="./img/screenshot.png">