MédiaWiki:Apihelp-query+revisions+base-param-limit
Limit how many revisions will be returned. If $3prop=content, $3prop=parsetree, $3diffto or $3difftotext is used, the limit is $1. If $3parse is used, the limit is $2.
Limit how many revisions will be returned. If $3prop=content, $3prop=parsetree, $3diffto or $3difftotext is used, the limit is $1. If $3parse is used, the limit is $2.