Add docs for topology-tags command

[nickdelnano]

related issue: #1268

Description

docs only change to add docs for the topology-tags command. I put the changed file into a markdown editor to confirm the styling.

• contributed code is using same conventions as original code

Please make sure the PR passes CI tests. For your information, CI tests the following:

• code is formatted via gofmt (please avoid goimports)
• code passes compilation
• code passes unit tests
• code passes integration tests with MySQL backend
• code passes integration tests with SQLite backend
• There are no orphaned docs/ pages (there's some link in the docs to point to any page)
• upgrade from previous version (master branch) is successful

👍

[shlomi-noach]

thank you!