vim-patch:9.1.1933: completion: complete_match() is not useful (#36726)

Problem:  completion: complete_match() Vim script function and
          'isexpand' option are not that useful and confusing
          (after v9.1.1341)
Solution: Remove function and option and clean up code and documentation
          (Girish Palya).

complete_match() and 'isexpand' add no real functionality to Vim. They
duplicate what `strridx()` already does, yet pretend to be part of the
completion system. They have nothing to do with the completion mechanism.

* `f_complete_match()` in `insexpand.c` does not call any completion code.
   It’s just a `STRNCMP()` wrapper with fluff logic.
* `'isexpand'` exists only as a proxy argument to that function.
   It does nothing on its own and amounts to misuse of a new option.

The following Vim script function can be used to implement the same
functionality:

```vim
  func CompleteMatch(triggers, sep=',')
    let line = getline('.')->strpart(0, col('.') - 1)
    let result = []
    for trig in split(a:triggers, a:sep)
      let idx = strridx(line, trig)
      if l:idx >= 0
        call add(result, [idx + 1, trig])
      endif
    endfor
    return result
  endfunc
```

related: vim/vim#16716
fixes: vim/vim#18563
closes: vim/vim#18790

cbcbff8712

Co-authored-by: Girish Palya <girishji@gmail.com>

runtime/scripts/optwin.lua

@@ -406,7 +406,6 @@ local options_list = {
     header = N_ 'language specific',
     { 'isfname', N_ 'specifies the characters in a file name' },
     { 'isident', N_ 'specifies the characters in an identifier' },
-    { 'isexpand', N_ 'defines trigger strings for complete_match()' },
     { 'iskeyword', N_ 'specifies the characters in a keyword' },
     { 'isprint', N_ 'specifies printable characters' },
     { 'quoteescape', N_ 'specifies escape characters in a string' },