Remove mention of the removed commands

[XVilka]

See https://github.com/rizinorg/rizin/commit/9586737a9b2febee94f9c9131953382db053484e and https://github.com/rizinorg/rizin/commit/881058693da252ba41c93e7d264183cdba97cd1b

• Remove join command
• Remove head command
• Remove less and directly list ls command
• Remove T commands and log related functions
• Remove u commands and Q alias
• Remove : commands
• Remove ' command (alias for =!)
• Remove \ (alias for =!) command
• Remove m commands

[XVilka]

Partially done in https://github.com/rizinorg/book/commit/97e35f3938b7db29f402d973b9a7129e708c130c

[officialcjunior]

I think, a lot of them haven't even been added to the book for us to remove, from what I can see. I searched for a few. l will continue looking for them. If someone already knows where it could be present, just point it out so that I can get it done.

[FortStatement]

Also pdc from https://github.com/rizinorg/rizin/pull/105 - Still present in ioli_0x02 and Comparing Bytes

[officialcjunior]

Should we just remove that part? It also has an instance of r2dec.

[wargio]

yes, probably, unless you want to update it with a section related to the decompilers (jsdec and rz-ghidra)