Refs #9589. Cleaned up documentation for PoldiAutoCorrelation.

Added usage examples, checked summary and properties, expanded description and added example spectra.
Merge remote-tracking branch 'origin/master' into feature/9589_check_documentation_sinq_poldi
Refs #9589. Removed cleanup section from PoldiAutoCorrelation docs.

It became unnecessary after merging the changes from master.
Refs #9589. Added usage example for PoldiMerge.

It required another data file to make sense.
Refs #9589. Cleaned up documentation of PoldiPeakSearch.
Refs #9589. Updated docs for legacy POLDI algorithms.

This documentation will not be changed until final decisions about their further treatment have been made.
Refs #9589. Added usage example for PoldiFitPeaks1D.
Refs #9859. Added note to PoldiPeakSearch docs, moved PoldiProjectRun
Refs #9589. Changed category of PoldiFitPeaks1D.
Merge remote-tracking branch 'origin/bugfix/9429_monitor_workspaces_not_being_replaced_when_new_added_event_mode_data_is_assigned'
Merge remote-tracking branch 'origin/feature/9575_Usage_examples_nd'
Merge remote-tracking branch 'origin/feature/9594_catalog_check_if_logged_in'
Merge remote branch 'origin/feature/9563_beam_monitor_packets'
Merge remote-tracking branch 'origin/master' into feature/9589_check_documentation_sinq_poldi
Merge branch 'feature/9589_check_documentation_sinq_poldi' into develop