README: Improve code examples [skip ci]
README: Improve code examples [skip ci]

outstand/ransack,amboxer21/ransack,roman-franko/ransack,laserlemon/ransack,AndrewSwerlick/ransack,guilleva/ransack,Mario245/ransack,martndemus/ransack,mariorcardoso/ransack,reinteractive/ransack,johan--/ransack,avit/ransack,nagyt234/ransack,vaski/ransack,Eric-Guo/ransack,activerecord-hackery/ransack