update architecture diagram

[ashnamehrotra]

What steps did you take and what happened: [A clear and concise description of what the bug is.] Update https://azure.github.io/eraser/docs/architecture to reflect rename of eraser container.

What did you expect to happen:

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.]

Environment:

• Eraser version:
• Kubernetes version: (use kubectl version):