Use 'read-multiple-choice' in 'markdown-ts-mode' (bug#81027)

Replace the "c" character-prompt interactive spec with
'read-multiple-choice', which presents named options instead of
requiring users to decode the prompt string and type a single
character.

* lisp/textmodes/markdown-ts-mode.el
(markdown-ts-table-align-column): Use 'read-multiple-choice'.
Adjust ALIGN docstring punctuation.
* lisp/textmodes/markdown-ts-mode-x.el
(markdown-ts-toc-insert-template): Use 'read-multiple-choice'.

lisp/textmodes/markdown-ts-mode-x.el

@@ -736,7 +736,11 @@ is nil and the command is run interactively, prompt for a template.
 The basic template uses all defaults and is likely the best choice for
 most uses.  The complete template illustrates all parameters set to
 their defaults and is useful as a starting point to customize a table."
-  (interactive "cTemplate [b]asic [c]omplete:")
+  (interactive
+   (list (car (read-multiple-choice
+               "Table of contents template"
+               '((?b "basic")
+                 (?c "complete"))))))
   (pcase char
     (?b
      (insert "<!-- markdown-ts-toc: -->\n"

lisp/textmodes/markdown-ts-mode.el

@@ -4392,13 +4392,18 @@ Note: To compute the column, point must be within the column and cannot
 be on the leading or trailing whitespace or on a column delimiter.
 
 ALIGN can be one of the symbols `left', `center', `right' or nil for
-unspecified or the characters l, c, or r.
+unspecified, or the characters l, c, or r.
 
 If ALIGN is nil, assume unspecified.  Make the alignment string a
 minimum of 5 characters to accommodate Markdown conventions.
 
 If point is not at a table, do nothing."
-  (interactive "cAlign column [l]eft [c]enter [r]ight [u]nspecified:")
+  (interactive
+   (list (car (read-multiple-choice
+               "Align column" '((?l "left")
+                                (?c "center")
+                                (?r "right")
+                                (?u "unspecified"))))))
   (markdown-ts--barf-if-not-mode 'markdown-ts-table-align-column)
   (setq align (if (characterp align)
                   (pcase align (?l 'left) (?c 'center) (?r 'right))