vim-patch:992e307: runtime(doc): update list of modifiers at :h expand() (#35957)

fixes: vim/vim#18435

992e30774f

Co-authored-by: Christian Brabandt <cb@256bit.org>

runtime/lua/vim/_meta/vimfn.lua

@@ -1893,6 +1893,9 @@ function vim.fn.exp(expr) end
 ---   :r    Root (one extension removed)
 ---   :e    Extension only
 ---
+--- More modifiers are supported, for the full list see
+--- |filename-modifiers|.
+---
 --- Example: >vim
 ---   let &tags = expand("%:p:h") .. "/tags"
 --- <Note that when expanding a string that starts with '%', '#' or