docs: statusline

fix https://github.com/neovim/neovim/issues/38670

(cherry picked from commit 6b796696c3)

runtime/lua/vim/_meta/options.lua

@@ -6749,11 +6749,15 @@ vim.wo.stc = vim.wo.statuscolumn
 
 --- Sets the `status-line`.
 ---
---- The option consists of printf style '%' items interspersed with
---- normal text.  Each status line item is of the form:
+--- Contains printf-style "%" items interspersed with normal text, where
+--- each item has the form:
+--- ```
 ---   %-0{minwid}.{maxwid}{item}
---- All fields except the {item} are optional.  A single percent sign can
---- be given as "%%".
+--- ```
+---
+--- All fields except {item} are optional.  Use "%%" to show a literal "%"
+--- char.  Setting this option to empty (`:set statusline=`) sets its
+--- value to the default.
 ---
 --- 						*stl-%!*
 --- When the option starts with "%!" then it is used as an expression,