Fix broken links in internal docs

src/librustc/dep_graph/graph.rs

@@ -158,8 +158,8 @@ impl DepGraph {
     /// what state they have access to. In particular, we want to
     /// prevent implicit 'leaks' of tracked state into the task (which
     /// could then be read without generating correct edges in the
-    /// dep-graph -- see the [README] for more details on the
-    /// dep-graph). To this end, the task function gets exactly two
+    /// dep-graph -- see the module-level [README] for more details on
+    /// the dep-graph). To this end, the task function gets exactly two
     /// pieces of state: the context `cx` and an argument `arg`. Both
     /// of these bits of state must be of some type that implements
     /// `DepGraphSafe` and hence does not leak.
@@ -178,7 +178,7 @@ impl DepGraph {
     /// - If you need 3+ arguments, use a tuple for the
     ///   `arg` parameter.
     ///
-    /// [README]: README.md
+    /// [README]: https://github.com/rust-lang/rust/blob/master/src/librustc/dep_graph/README.md
     pub fn with_task<C, A, R, HCX>(&self,
                                    key: DepNode,
                                    cx: C,

src/librustc/hir/mod.rs

@@ -588,7 +588,9 @@ pub type CrateConfig = HirVec<P<MetaItem>>;
 /// The top-level data structure that stores the entire contents of
 /// the crate currently being compiled.
 ///
-/// For more details, see [the module-level README](README.md).
+/// For more details, see the module-level [README].
+///
+/// [README]: https://github.com/rust-lang/rust/blob/master/src/librustc/hir/README.md.
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Debug)]
 pub struct Crate {
     pub module: Mod,

src/librustc/mir/mod.rs

@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! MIR datatypes and passes. See [the README](README.md) for details.
+//! MIR datatypes and passes. See the module-level [README] for details.
+//!
+//! [README]: https://github.com/rust-lang/rust/blob/master/src/librustc/mir/README.md
 
 use graphviz::IntoCow;
 use middle::const_val::ConstVal;

src/librustc/ty/context.rs

@@ -778,8 +778,10 @@ impl<'tcx> CommonTypes<'tcx> {
 
 /// The central data structure of the compiler. It stores references
 /// to the various **arenas** and also houses the results of the
-/// various **compiler queries** that have been performed. See [the
-/// README](README.md) for more deatils.
+/// various **compiler queries** that have been performed. See the
+/// module-level [README] for more details.
+///
+/// [README]: https://github.com/rust-lang/rust/blob/master/src/librustc/ty/README.md
 #[derive(Copy, Clone)]
 pub struct TyCtxt<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
     gcx: &'a GlobalCtxt<'gcx>,

src/librustc/ty/sty.rs

@@ -1647,10 +1647,8 @@ impl<'a, 'gcx, 'tcx> TyS<'tcx> {
     ///
     /// Note that during type checking, we use an inference variable
     /// to represent the closure kind, because it has not yet been
-    /// inferred. Once [upvar inference] is complete, that type varibale
-    /// will be unified.
-    ///
-    /// [upvar inference]: src/librustc_typeck/check/upvar.rs
+    /// inferred. Once upvar inference (in `src/librustc_typeck/check/upvar.rs`)
+    /// is complete, that type variable will be unified.
     pub fn to_opt_closure_kind(&self) -> Option<ty::ClosureKind> {
         match self.sty {
             TyInt(int_ty) => match int_ty {

src/librustc_plugin/lib.rs

@@ -57,7 +57,7 @@
 //! #![plugin(myplugin)]
 //! ```
 //!
-//! See the [`plugin` feature](../../unstable-book/language-features/plugin.html) of
+//! See the [`plugin` feature](../unstable-book/language-features/plugin.html) of
 //! the Unstable Book for more examples.
 
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",