Update docs to fix various 404s

src/libcore/result.rs

@@ -92,7 +92,7 @@
 //! useful value.
 //!
 //! Consider the `write_line` method defined for I/O types
-//! by the [`Writer`](../io/trait.Writer.html) trait:
+//! by the [`Writer`](../old_io/trait.Writer.html) trait:
 //!
 //! ```
 //! # #![feature(old_io)]

src/librustc/plugin/mod.rs

@@ -47,7 +47,7 @@
 //! #![plugin(myplugin)]
 //! ```
 //!
-//! See [the compiler plugin guide](../../guide-plugin.html)
+//! See the [Plugins Chapter](../../book/plugins.html) of the book
 //! for more examples.
 
 pub use self::registry::Registry;

src/libstd/lib.rs

@@ -67,9 +67,8 @@
 //! module encapsulates the platform-specific rules for dealing
 //! with file paths.
 //!
-//! `std` also includes modules for interoperating with the
-//! C language: [`c_str`](c_str/index.html) and
-//! [`c_vec`](c_vec/index.html).
+//! `std` also includes the [`ffi`](ffi/index.html) module for interoperating
+//! with the C language.
 //!
 //! ## Concurrency, I/O, and the runtime
 //!