For anyone interested in helping to improve Base Documentation for LibreOffice you are cordially invited to get involved with LibreOffice Documentation Team.
Information on getting started with the group (slightly out of date and actively being updated) can be found here:
https://wiki.documentfoundation.org/Documentation/Development (One example of the changes happening, in the past the group used web resources at the ODFAuthors web site, which was hosted by TDF, for collaboration and work flow management - the group is transitioning to use the TDF NextCloud server with LibreOffice Online integration for this and the ODFAuthors site will be retired.)
For English speakers there is a weekly on-line meeting every Wednesday. All that is required to join in one of the meetings is a web browser and a microphone that works. Details are available on the documenation mailing list at The Document Foundation. ( You find information about that ML at https://wiki.documentfoundation.org/Documentation/Mailing_List )
For non English speakers the Native Language groups have their own arrangements.
At present the group is focused on, and actively working on, the update of the Calc Guide to bring it current with the pending LO 6.2 release.However with the looming switch from HSQLdb to Firebird for the embedded database in Base there will be a push to address Base documentation soon.
Looking forward to meeting you there.