add missing caching command in client help (#7399)
add missing caching command in client help (#7399)


soloestoy/redis,ofirluzon/redis,charsyam/redis,ofirluzon/redis,antirez/redis,antirez/redis,charsyam/redis,ofirluzon/redis,ctripcorp/redis,oranagra/redis,soloestoy/redis,soloestoy/redis,neomantra/redis,oranagra/redis,ctripcorp/redis,yossigo/redis,neomantra/redis,ofirluzon/redis,yossigo/redis,ctripcorp/redis,PKRoma/redis,neomantra/redis,oranagra/redis,PKRoma/redis,neomantra/redis,ctripcorp/redis,PKRoma/redis,PKRoma/redis,soloestoy/redis,yossigo/redis,antirez/redis,neomantra/redis,soloestoy/redis,ofirluzon/redis,charsyam/redis,yossigo/redis,charsyam/redis,oranagra/redis,antirez/redis,yossigo/redis,oranagra/redis,PKRoma/redis,charsyam/redis