Update some old references to rust.md

Author: Keegan McAllister

src/doc/README.md

@@ -33,7 +33,7 @@ something like:
 pandoc --from=markdown --to=html5 --number-sections -o reference.html reference.md
 ~~~~
 
-(rust.md being the Rust Reference Manual.)
+(reference.md being the Rust Reference Manual.)
 
 The syntax for pandoc flavored markdown can be found at:
 http://johnmacfarlane.net/pandoc/README.html#pandocs-markdown

src/doc/complement-design-faq.md

@@ -39,7 +39,7 @@ representation as a primitive. This allows using Rust `enum`s in FFI where C
 `enum`s are also used, for most use cases. The attribute can also be applied
 to `struct`s to get the same layout as a C struct would.
 
-[repr]: rust.html#miscellaneous-attributes
+[repr]: reference.html#miscellaneous-attributes
 
 ## There is no GC
 

src/libsyntax/feature_gate.rs

@@ -73,7 +73,7 @@ static KNOWN_FEATURES: &'static [(&'static str, Status)] = &[
 
     ("if_let", Active),
 
-    // if you change this list without updating src/doc/rust.md, cmr will be sad
+    // if you change this list without updating src/doc/reference.md, cmr will be sad
 
     // A temporary feature gate used to enable parser extensions needed
     // to bootstrap fix for #5723.