[docs] improve doc page for get_table_rows chain api plugin

[iamveritas]

trafficstars

this was generated from community feedback, see here https://t.me/c/1139062279/280871

reading this doc page https://developers.eos.io/manuals/eos/latest/nodeos/plugins/chain_api_plugin/api-reference/index#operation/get_table_rows is it not clear, when using this api, how do I continue on to get the next 500 or 1000 results?