Change link to CRON Documentation in Scheduler
Update how_to_use_filters_on_query.md

Language and clarity fixes.
Merge pull request #1187 from emmanuel-keller/master

Implements #1183
Merge pull request #1191 from emmanuel-keller/master

Implements #1188
Merge pull request #1163 from AlexandreToyer/cron_doc_link

Change link to CRON Documentation in Scheduler