docs: miscellaneous doc and type fixes (#25554)

runtime/lua/vim/_meta/api.lua

@@ -1,4 +1,4 @@
---- @meta
+--- @meta _
 -- THIS FILE IS GENERATED
 -- DO NOT EDIT
 error('Cannot require a meta file')

runtime/lua/vim/_meta/api_keysets.lua

@@ -1,4 +1,4 @@
---- @meta
+--- @meta _
 -- THIS FILE IS GENERATED
 -- DO NOT EDIT
 error('Cannot require a meta file')

runtime/lua/vim/_meta/options.lua

@@ -1,4 +1,4 @@
---- @meta
+--- @meta _
 -- THIS FILE IS GENERATED
 -- DO NOT EDIT
 error('Cannot require a meta file')
@@ -2276,7 +2276,7 @@ vim.go.fcl = vim.go.foldclose
 ---     "auto":       resize to the minimum amount of folds to display.
 ---     "auto:[1-9]": resize to accommodate multiple folds up to the
 --- 		  selected level
----     0:            to disable foldcolumn
+---     "0":          to disable foldcolumn
 ---     "[1-9]":      to display a fixed number of columns
 --- See `folding`.
 ---

runtime/lua/vim/_meta/vimfn.lua

@@ -1,4 +1,4 @@
---- @meta
+--- @meta _
 -- THIS FILE IS GENERATED
 -- DO NOT EDIT
 error('Cannot require a meta file')
@@ -8055,7 +8055,7 @@ function vim.fn.shellescape(string, special) end
 --- will be assumed.
 ---
 --- @param col? integer
---- @return any
+--- @return integer
 function vim.fn.shiftwidth(col) end
 
 --- @param name string