kill-sexp docstring

[Stephen Eglen]

The doc strings of kill-sexp and backward-kill-sexp are currently:

  "Kill the sexp (balanced expression) following THE CURSOR.
With ARG, kill that many sexps after THE CURSOR.
Negative arg -N means kill N sexps before THE CURSOR."

  "Kill the sexp (balanced expression) preceding THE CURSOR.
With ARG, kill that many sexps before THE CURSOR.
Negative arg -N means kill N sexps after THE CURSOR."

I've highlighted in caps `the cursor'; should we change each instance
to "point"?

Stephen