undocumented C-k behaviour for help page

[Dan Jacobson]

In help it doesn't mention what happens when one hits c-k in a read
only buffer.  The bell rings and we feel bad, but don't know that all [?]
these years it indeed was adding to the kill ring and I didn't have to
do the finger numbing sequence of cautiously marking a region and ESC
w on it, etc.  Wait, C-w does the same...  Wait, the C-w help page has
it documented.  C-k doesn't!  And all these years I was doing it the
hard way.

I didn't check if info has it documented.
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