document maximum value of per_page query param
document maximum value of per_page query param

librariesio/libraries.io,abrophy/libraries.io,librariesio/libraries.io,librariesio/libraries.io,abrophy/libraries.io,tomnatt/libraries.io,samjacobclift/libraries.io,tomnatt/libraries.io,librariesio/libraries.io,abrophy/libraries.io,tomnatt/libraries.io,samjacobclift/libraries.io,samjacobclift/libraries.io