metrics.tpo glossary bandwidth terms

Is bandwidth history the descriptor observed-bandwidth[1]?.

Since there are several bandwidth terms and they can be confusing, it might be useful to add a link to the spec in the definition?, or add where it comes from?.

Maybe that should be also done for advertised bandwidth and consesus weight?

[1] https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n427