ctl-x-map key binding conventions for new major/minor modes

[Tino Calancha]

(info "(elisp) Key Binding Conventions")

Do we need a recommendation in this node about bindings with
prefix 'C-x'?
There is no guidance in the node above about this topic.

Just loading a new mode shouldn't shadow some previous
C-x bindings, right?

For instance,

* timeclock.el suggests some C-x bindings in the comentary, that is,
  it doesn't define these bindings by default.

* dired-x.el has the user option `dired-bind-jump' to control if
  `dired-jump' must be bound or not to 'C-x C-j'.

* find-func.el has the autoloaded function `find-function-setup-keys',
  which binds some commands into `ctl-x-map'.

Regards,
Tino