Append Lc root commands help in ? help message

[trufae]

all those commands should be listed in the help message associated, maybe some are in the root, maybe others are in subcommands. that must be chosen by the plugin itself

[0x00000000]> Lc
a2f        The reworked analysis from scratch thing
agD        agD core plugin
java       Suite of java commands, java help for more info
prj        Experimental binary projects
sixref     quickly find xrefs in arm64 buffer
decai      r2 decompiler based on r2ai
sarif      Manage SARIF documents
r2jadx     jadx decompiler for radare2
goresym    rename symbols with goresym
codeshare  pull and run codeshare scripts via r2frida
[0x00000000]>