vim-patch:17ad852: runtime(doc): update return types for builtin functions

fixes: vim/vim#17273

credit: Github user @msoyka2024

17ad852a62

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

runtime/lua/vim/_meta/vimfn.lua

@@ -1350,6 +1350,8 @@ function vim.fn.cursor(lnum, col, off) end
 --- position within a <Tab> or after the last character.
 --- Returns 0 when the position could be set, -1 otherwise.
 ---
+--- Returns 0 when the position could be set, -1 otherwise.
+---
 --- @param list integer[]
 --- @return any
 function vim.fn.cursor(list) end
@@ -2197,7 +2199,7 @@ function vim.fn.filter(expr1, expr2) end
 --- @param name string
 --- @param path? string
 --- @param count? integer
---- @return any
+--- @return string|string[]
 function vim.fn.finddir(name, path, count) end
 
 --- Just like |finddir()|, but find a file instead of a directory.
@@ -2209,8 +2211,8 @@ function vim.fn.finddir(name, path, count) end
 ---
 --- @param name string
 --- @param path? string
---- @param count? any
---- @return any
+--- @param count? integer
+--- @return string|string[]
 function vim.fn.findfile(name, path, count) end
 
 --- Flatten {list} up to {maxdepth} levels.  Without {maxdepth}
@@ -8150,6 +8152,8 @@ function vim.fn.setcursorcharpos(lnum, col, off) end
 ---   call cursor(4, 3)
 --- <positions the cursor on the first character '여'.
 ---
+--- Returns 0 when the position could be set, -1 otherwise.
+---
 --- @param list integer[]
 --- @return any
 function vim.fn.setcursorcharpos(list) end