remove incorrect info

Closes rust-lang#1433

Author: tshepang

src/the-parser.md

@@ -52,9 +52,9 @@ Code for lexical analysis is split between two crates:
   constituting tokens. Although it is popular to implement lexers as generated
   finite state machines, the lexer in `rustc_lexer` is hand-written.
 
-- [`StringReader`] from [`rustc_ast`][rustc_ast] integrates `rustc_lexer` with `rustc`
-  specific data structures. Specifically, it adds `Span` information to tokens
-  returned by `rustc_lexer` and interns identifiers.
+- [`StringReader`] integrates `rustc_lexer` with data structures specific to `rustc`.
+  Specifically,
+  it adds `Span` information to tokens returned by `rustc_lexer` and interns identifiers.
 
 [rustc_ast]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/index.html
 [rustc_errors]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_errors/index.html