Storage example for Greenlight has an = too much at the end

[lonesomewalker]

https://docs.bigbluebutton.org/greenlight/gl-config.html#updating-from-version-prior-to-27

Example says:

    volumes:
      - ./log:/usr/src/app/log
      - ./storage:/usr/src/app/storage=

Working example should be:

    volumes:
      - ./log:/usr/src/app/log
      - ./storage:/usr/src/app/storage

Sorry for not sending a pull request, but currently travelling without equipment.

[farhatahmad]

Good catch and thank you for reporting it