bug#6787: Documentation: `kill-region' is not a primitive despite docstring assertion otherwise

[MON KEY]

Docstring of `kill-region' describes itself as a primitive.
With Emacs lisp's conventional context for the term "primitive" this isn't so.

,---- (documentation 'kill-region)
|
| {...}
|
| This is the primitive for programs to kill text (as opposed to deleting it).
|
| {...}
|
`----

(subrp 'kill-region)
=> nil

,---- (info "(elisp)Primitive Function Type")
|
| A "primitive function" is a function callable from Lisp but written in
| the C programming language.  Primitive functions are also called
| "subrs" or "built-in functions".  (The word "subr" is derived from
| "subroutine.")
|
`----

Problem is current throgh Bzr-100920

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