moved collections from libextra into libcollections

src/doc/index.md

@@ -38,6 +38,7 @@ li {list-style-type: none; }
 * [The Rust compiler, `librustc`](rustc/index.html)
 
 * [The `arena` allocation library](arena/index.html)
+* [The `collections` library](collections/index.html)
 * [The `flate` compression library](flate/index.html)
 * [The `getopts` argument parsing library](getopts/index.html)
 * [The `glob` file path matching library](glob/index.html)

src/doc/rust.md

@@ -881,7 +881,7 @@ use foo::baz::foobaz;    // good: foo is at the root of the crate
 mod foo {
     extern mod extra;
 
-    use foo::extra::list;  // good: foo is at crate root
+    use foo::extra::time;  // good: foo is at crate root
 //  use extra::*;          // bad:  extra is not at the crate root
     use self::baz::foobaz; // good: self refers to module 'foo'
     use foo::bar::foobar;  // good: foo is at crate root