docs: backtick parameter references in API comments

source/parser/parse.hon

@@ -29,8 +29,8 @@ State :: struct {
     next_token usize
 }
 
-#! borrows tokens and source while parsing; the returned Tree borrows source until ast.deinit.
-#! allocator supplies returned node storage and temporary lists released before return.
+#! borrows `tokens` and `source` while parsing; the returned Tree borrows `source` until ast.deinit.
+#! `allocator` supplies returned node storage and temporary lists released before return.
 #! the caller owns the Tree and must release it with ast.deinit.
 parse proc(
     allocator mem.Allocator,