Fix location of linux checks.d dir in agent checks guide
Fix location of linux checks.d dir in agent checks guide

jhotta/documentation,macobo/documentation,macobo/documentation,inokappa/documentation,inokappa/documentation,jhotta/documentation,inokappa/documentation,macobo/documentation,jhotta/documentation,macobo/documentation,inokappa/documentation,jhotta/documentation,inokappa/documentation,jhotta/documentation,macobo/documentation,jhotta/documentation