fix comment for TokenCursor::desugar

the hashes of the text were forgotten.

compiler/rustc_parse/src/parser/mod.rs

@@ -317,7 +317,7 @@ impl TokenCursor {
         // required to wrap the text. E.g.
         // - `abc d` is wrapped as `r"abc d"` (num_of_hashes = 0)
         // - `abc "d"` is wrapped as `r#"abc "d""#` (num_of_hashes = 1)
-        // - `abc "##d##"` is wrapped as `r###"abc "d""###` (num_of_hashes = 3)
+        // - `abc "##d##"` is wrapped as `r###"abc ##"d"##"###` (num_of_hashes = 3)
         let mut num_of_hashes = 0;
         let mut count = 0;
         for ch in data.as_str().chars() {