Use substitute-command-keys more in Calc help

Use substitute-command-keys more in Calc help

* lisp/calc/calc-ext.el (calc-do-prefix-help):
* lisp/calc/calc-help.el (calc-help-prefix, calc-help-for-help)
(calc-h-prefix-help, calc-inverse-prefix-help)
(calc-hyperbolic-prefix-help, calc-inv-hyp-prefix-help)
(calc-f-prefix-help, calc-s-prefix-help, calc-r-prefix-help)
(calc-j-prefix-help, calc-a-prefix-help, calc-b-prefix-help)
(calc-c-prefix-help, calc-d-prefix-help, calc-g-prefix-help)
(calc-k-prefix-help, calc-m-prefix-help, calc-t-prefix-help)
(calc-u-prefix-help, calc-l-prefix-help, calc-v-prefix-help):
* lisp/calc/calc-misc.el (calc-dispatch-help, calc-help):
* lisp/calc/calc.el (calc-do-dispatch): Use substitute-command keys.