Allow :: to end links regardless of parenthesis.

src/parser/plain_link.rs

@@ -259,7 +259,7 @@ fn impl_path_plain_end<'b, 'g, 'r, 's>(
     enable_search_option: bool,
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
     let current_depth = input.get_parenthesis_depth() - starting_parenthesis_depth;
-    if enable_search_option && current_depth == 0 {
+    if enable_search_option {
         let search_option = peek(tag("::"))(input);
         if search_option.is_ok() {
             return search_option;