[Docs] Update update-settings.asciidoc (#35073)
[Docs] Update update-settings.asciidoc (#35073)

Add explanation for ?include_defaults parameter and link to
Cluster Get Settings reference
vroyer/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra