Add suggestions as comments for cfg configurations

[vchrombie]

This commit updates the cfg configs by commenting the optional/suggested configs in the example configurations.

#203

[vchrombie]

Hi @mgalexander, thanks for opening the issue #203.

I think this approach would solve the issue of errors popping up while we copy paste the configuration. Would you like to give it a try?

setup.cfg

[githubql]
raw_index = github_event_raw
enriched_index = github_event_enriched
api-token = xxxxx
sleep-for-rate = true
sleep-time = "300" # (optional)
no-archive = true # (suggested)
studies = [enrich_duration_analysis:kanban, enrich_reference_analysis] # (optional)

Also @sduenas, do you think we should follow this approach everywhere is GrimoireLab.

[vchrombie]

This should solve the issue of errors because of copy pasting the configurations. I will be merging this since there are no objections. Will decide on implementing this on the other repositories as well.

Thanks.