Remove documentation links for repo packages.

pub.dartlang.org will now automatically link to dartdocs.org for
packages with no documentation link.

BUG= http://dartbug.com/20177, http://dartbug.com/20178, http://dartbug.com/20186
R=sigmund@google.com

Review URL: https://codereview.chromium.org//416973003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/crypto@38551 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/pubspec.yaml b/pubspec.yaml
index ff692ac..c07af24 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,6 +5,5 @@
 homepage: http://www.dartlang.org
 environment:
   sdk: '>=0.8.10+6 <2.0.0'
-documentation: http://api.dartlang.org/docs/pkg/crypto
 dev_dependencies:
   unittest: '>=0.10.0 <0.11.0'