* doc/misc/eieio.texi: Update to account for the cl-generic facilities

* doc/misc/eieio.texi: Update to account for the cl-generic facilities

(Quick Start, Class Options, Generics): Adjust names for cl-generic.
(Methods): Document cl-defmethod.
Explain in more detail the order in which the various
methods are executed.  Document the conditions under which a method
is redefined.  Remove reference to `eieio-generic-call-arglst`.
Don't document the precise return value of cl-next-method-p.
(Static Methods): Adjust to use `subclass` specializer.
(Method Invocation): Use cl-call-next-method and drop mention of :primary.
(Signal Handling, Signals): Adjust names and args for cl-generic; add
cl-no-primary-method.
(CLOS compatibility, Wish List): Adjust to new featureset.