bug#46710: 27.1; `calc' sub-menu item invokes non-existent `calc-mult' function.

[Mark Harig via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Emacs Maintainers,

  It appears that a menu item in the ‘calc’ package attempts
  to invoke a function that does not exist.

  Recipe for producing the error, starting with "emacs -Q"
  (Emacs version 27.1)

  1. Start the ‘calc’ programmable calculator in Emacs with
  the keystrokes: C-x * c

  2. Enter two three-element vectors onto calc’s stack with
  the following keystrokes, separating each character with a
  space or comma:
  [ 1 2 3 ]
  [ 4 5 6 ]

  3. Attempting to calculate the dot product of the two
  vectors using the Calc menu item: Calc -> Matrices/Vectors
  -> Vectors -> (2:) dot (:1)

    Emacs responds with the following error message in the
  echo area: "Wrong type argument: commandp, calc-mult".

    Note that the menu item also documents the keystroke
  alternative, ‘*’.  C-h k * reports that ‘*’ invokes the
  function ‘calc-times’.  Likewise, the alternative menu
  item Calc -> Matrices/Vectors -> Matrices -> (2:) dot (:1)
  also invokes the function ‘calc-times’.  This menu item
  and ‘*’ produce the same result.

  The Calc -> Matrices/Vectors -> Vectors sub-menu is
  defined in the file calc-menu.el (in the lisp/calc
  sub-directory): (defvar calc-vectors-menu ...).
  The entry that lists the non-existent ‘calc-mult’ function  reads:
              ["(2:) dot (1:)"
              calc-mult
              :keys "*"
              :active (>= (calc-stack-size) 2)
              :help "The dot product"]

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