Clarify use of custom LTI params in docs
Arising from discussion on users list.
refers to custom parameters like custom_series, but most LMSes will allow these to be configured without the custom_ prefix, so that should be clarified in the docs.
Would you mind to accept/merge these and I will try to do it better next time?
Thanks for improving the docs! I'd suggest you submit all the changes under a single JIRA and PR against 3.x (rather than develop, as documentation improvements are more like bugfixes than features, as long as they're applicable to that version).