remove extra mod doc;s

Author: steveklabnik

src/librustc/middle/infer/region_inference/mod.rs

@@ -38,7 +38,6 @@ use std::iter::repeat;
 use std::u32;
 use syntax::ast;
 
-mod doc;
 mod graphviz;
 
 // A constraint that influences the inference process.

src/librustc_trans/trans/mod.rs

@@ -19,7 +19,6 @@ pub use self::common::gensym_name;
 #[macro_use]
 mod macros;
 
-mod doc;
 mod inline;
 mod monomorphize;
 mod controlflow;

src/librustc_typeck/check/method/mod.rs

@@ -32,7 +32,6 @@ pub use self::CandidateSource::*;
 pub use self::suggest::{report_error, AllTraitsVec};
 
 mod confirm;
-mod doc;
 mod probe;
 mod suggest;