Update parser_tt docs following rust-lang/rust#95555

src/macro-expansion.md

@@ -227,7 +227,7 @@ only within the macro (i.e. it should not be visible outside the macro).
 [code_dir]: https://github.com/rust-lang/rust/tree/master/compiler/rustc_expand/src/mbe
 [code_mp]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/mbe/macro_parser
 [code_mr]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/mbe/macro_rules
-[code_parse_int]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/mbe/macro_parser/fn.parse_tt.html
+[code_parse_int]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/mbe/macro_parser/struct.TtParser.html#method.parse_tt
 [parsing]: ./the-parser.html
 
 The context is attached to AST nodes. All AST nodes generated by macros have
@@ -503,9 +503,10 @@ The interface of the macro parser is as follows (this is slightly simplified):
 
 ```rust,ignore
 fn parse_tt(
-    parser: &mut Cow<Parser>,
-    ms: &[TokenTree],
-) -> NamedParseResult
+    &mut self,
+    parser: &mut Cow<'_, Parser<'_>>,
+    matcher: &[MatcherLoc]
+) -> ParseResult
 ```
 
 We use these items in macro parser:
@@ -515,20 +516,20 @@ We use these items in macro parser:
   ask the MBE parser to parse. We will consume the raw stream of tokens and
   output a binding of metavariables to corresponding token trees. The parsing
   session can be used to report parser errors.
-- `ms` a _matcher_. This is a sequence of token trees that we want to match
-  the token stream against.
+- `matcher` is a sequence of `MatcherLoc`s that we want to match
+  the token stream against. They're converted from token trees before matching.
 
 In the analogy of a regex parser, the token stream is the input and we are matching it
-against the pattern `ms`. Using our examples, the token stream could be the stream of
-tokens containing the inside of the example invocation `print foo`, while `ms`
+against the pattern `matcher`. Using our examples, the token stream could be the stream of
+tokens containing the inside of the example invocation `print foo`, while `matcher`
 might be the sequence of token (trees) `print $mvar:ident`.
 
-The output of the parser is a `NamedParseResult`, which indicates which of
+The output of the parser is a [`ParseResult`], which indicates which of
 three cases has occurred:
 
-- Success: the token stream matches the given matcher `ms`, and we have produced a binding
+- Success: the token stream matches the given `matcher`, and we have produced a binding
   from metavariables to the corresponding token trees.
-- Failure: the token stream does not match `ms`. This results in an error message such as
+- Failure: the token stream does not match `matcher`. This results in an error message such as
   "No rule expected token _blah_".
 - Error: some fatal error has occurred _in the parser_. For example, this
   happens if there are more than one pattern match, since that indicates
@@ -607,6 +608,7 @@ Because the Rust ABI is unstable, we use the C ABI for this conversion.
 [stablets]: https://doc.rust-lang.org/proc_macro/struct.TokenStream.html
 [pm]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/proc_macro/index.html
 [pms]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/proc_macro_server/index.html
+[`ParseResult`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/mbe/macro_parser/enum.ParseResult.html
 
 TODO: more here. [#1160](https://github.com/rust-lang/rustc-dev-guide/issues/1160)