Fix some minor link errors.

src/macro-ambiguity.md

@@ -169,7 +169,7 @@ ANYTOKEN.
 
 (To review one's understanding of the above informal descriptions, the reader
 at this point may want to jump ahead to the [examples of
-FIRST/LAST][#examples-of-first-and-last] before reading their formal
+FIRST/LAST](#examples-of-first-and-last) before reading their formal
 definitions.)
 
 ### FIRST, LAST
@@ -318,7 +318,7 @@ Here are similar examples but now for LAST.
  * LAST(`$( $d:ident $e:expr );* $(h)*`) = { `$e:expr`, ε, `h` }
  * LAST(`$( $d:ident $e:expr );* $(h)* $( f ;)+`) = { `;` }
  * LAST(`$( $d:ident $e:expr );* $(h)* $( f ;)+ g`) = { `g` }
- 
+
 ### FOLLOW(M)
 
 Finally, the definition for FOLLOW(M) is built up as follows. pat, expr, etc.

src/undocumented.md

@@ -17,11 +17,9 @@ to shrink!
 
 [`libstd` facade]: https://github.com/rust-lang/rfcs/pull/40
 [Trait reform]: https://github.com/rust-lang/rfcs/pull/48
-[Attributes on `match` arms]: https://github.com/rust-lang/rfcs/pull/49
 [Attributes]: attributes.html
 [Flexible target specification]: https://github.com/rust-lang/rfcs/pull/131
-[Conditional compilation]: attributes.html#conditional-compilation
-[Integer overflow not `unsafe`]: https://github.com/rust-lang/rfcs/pull/560
+[Conditional compilation]: conditional-compilation.html
 [`dllimport`]: https://github.com/rust-lang/rfcs/pull/1717
 [FFI attributes]: attributes.html#ffi-attributes
 [define `crt_link`]: https://github.com/rust-lang/rfcs/pull/1721

src/unsafety.md

@@ -14,7 +14,7 @@ Rust:
 
 [`Copy`]: special-types-and-traits.html#copy
 [`union`]: items/unions.html
-[mutable static variable]: items/static-items.html#mutable-statics
-[external static variable]: items/external-blocks.html
+[mutable]: items/static-items.html#mutable-statics
+[external]: items/external-blocks.html
 [raw pointer]: types/pointer.html
 [unsafe trait]: items/traits.html#unsafe-traits