Properly escape \ in Path.wildcard docs (#13137)

Author: lukaszsamson

lib/elixir/lib/path.ex

@@ -759,9 +759,9 @@ defmodule Path do
   You may call `Path.expand/1` to normalize the path before invoking
   this function.
 
-  A character preceded by \ loses its special meaning.
-  Note that \ must be written as \\ in a string literal.
-  For example, "\\?*" will match any filename starting with ?.
+  A character preceded by `\\` loses its special meaning.
+  Note that `\\` must be written as `\\\\` in a string literal.
+  For example, `"\\\\?*"` will match any filename starting with `?.`.
 
   By default, the patterns `*` and `?` do not match files starting
   with a dot `.`. See the `:match_dot` option in the "Options" section