vim-patch:partial:f10911e: Update runtime files (#29936)

f10911e5db

Also cherry-pick E1142 and E1156 tags from Vim.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/options.lua

@@ -1058,6 +1058,14 @@ return {
         	v:fname_in		name of the input file
         	v:fname_out		name of the output file
         Note that v:fname_in and v:fname_out will never be the same.
+
+        If the 'charconvert' expression starts with s: or |<SID>|, then it is
+        replaced with the script ID (|local-function|). Example: >vim
+        	set charconvert=s:MyConvert()
+        	set charconvert=<SID>SomeConvert()
+        <	Otherwise the expression is evaluated in the context of the script
+        where the option was set, thus script-local items are available.
+
         This option cannot be set from a |modeline| or in the |sandbox|, for
         security reasons.
       ]=],