vim-patch:9.1.0039: too vague errors for 'listchars'/'fillchars' (#27070)

Problem:  too vague errors for 'listchars'/'fillchars'
Solution: Include the field name in error message.
          (zeertzjq)

related: #27050
closes: vim/vim#13877

6a8d2e1634

Co-authored-by: Cole Frankenhoff <cole.nhf@gmail.com>

runtime/lua/vim/_meta/options.lua

@@ -2197,7 +2197,7 @@ vim.bo.ft = vim.bo.filetype
 --- Characters to fill the statuslines, vertical separators and special
 --- lines in the window.
 --- It is a comma-separated list of items.  Each item has a name, a colon
---- and the value of that item:
+--- and the value of that item: `E1511`
 ---
 ---   item		default		Used for ~
 ---   stl		' '		statusline of the current window
@@ -2238,7 +2238,7 @@ vim.bo.ft = vim.bo.filetype
 ---
 --- For the "stl", "stlnc", "foldopen", "foldclose" and "foldsep" items
 --- single-byte and multibyte characters are supported.  But double-width
---- characters are not supported.
+--- characters are not supported. `E1512`
 ---
 --- The highlighting used for these items:
 ---   item		highlight group ~
@@ -3829,7 +3829,7 @@ vim.o.list = false
 vim.wo.list = vim.o.list
 
 --- Strings to use in 'list' mode and for the `:list` command.  It is a
---- comma-separated list of string settings.
+--- comma-separated list of string settings. *E1511*
 ---
 --- 						*lcs-eol*
 ---   eol:c		Character to show at the end of each line.  When
@@ -3921,7 +3921,7 @@ vim.wo.list = vim.o.list
 --- 		omitted.
 ---
 --- The characters ':' and ',' should not be used.  UTF-8 characters can
---- be used.  All characters must be single width.
+--- be used.  All characters must be single width. *E1512*
 ---
 --- Each character can be specified as hex:
 ---