update docs for json functions in sql
update docs for json functions in sql

acleasby/lnav,acleasby/lnav,sureshsundriyal/lnav,sureshsundriyal/lnav,acleasby/lnav,sureshsundriyal/lnav,tstack/lnav,tstack/lnav,tstack/lnav,sureshsundriyal/lnav,acleasby/lnav,tstack/lnav,acleasby/lnav