fix docstring reference to variable name

contracts/PackageRegistry.sol

@@ -63,7 +63,7 @@ contract PackageRegistry is Authorized, PackageRegistryInterface {
   //
   /// @dev Creates a a new release for the named package.  If this is the first release for the given package then this will also assign msg.sender as the owner of the package.  Returns success.
   /// @notice Will create a new release the given package with the given release information.
-  /// @param name Package name
+  /// @param packageName Package name
   /// @param version Version string (ex: '1.0.0')
   /// @param manifestURI The URI for the release manifest for this release.
   function release(