fix keybinding help strings
fix keybinding help strings

MatthewShao/mitmproxy,zlorb/mitmproxy,ujjwal96/mitmproxy,vhaupert/mitmproxy,zlorb/mitmproxy,vhaupert/mitmproxy,MatthewShao/mitmproxy,mitmproxy/mitmproxy,ujjwal96/mitmproxy,mhils/mitmproxy,cortesi/mitmproxy,Kriechi/mitmproxy,Kriechi/mitmproxy,Kriechi/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,cortesi/mitmproxy,vhaupert/mitmproxy,mitmproxy/mitmproxy,zlorb/mitmproxy,mitmproxy/mitmproxy,MatthewShao/mitmproxy,mhils/mitmproxy,vhaupert/mitmproxy,zlorb/mitmproxy,mitmproxy/mitmproxy,ujjwal96/mitmproxy,cortesi/mitmproxy,mhils/mitmproxy,cortesi/mitmproxy,Kriechi/mitmproxy,mhils/mitmproxy,ujjwal96/mitmproxy,MatthewShao/mitmproxy