6236 4.17 release notes updates

[djbrooke]

More release note updates based on things recently merged. $$

• closes Update Release Notes Prior to 4.17 Release #6236

[dataversebot]

Can one of the admins verify this patch?

[coveralls]

Coverage remained the same at 19.455% when pulling ebe8e7d on 6236-4.17-release-notes-updates into adf499e on develop.

[pdurbin]

@djbrooke heads up that I pushed ebe8e7d to reflect the recent pull requests that were merged having to do with external tools.

@kcondon I also emphasized in the guides that content type is required now for file level tools.

[djbrooke]

Thanks, I'll move this along to QA. Hooray 4.17!