* ext/openssl/ossl_asn1.c: [DOC] Document parts of
  OpenSSL::ASN1::ObjectId included a fix for the class overview, which
  previously showed the documentation for Constructive due to missing
  ObjectId overview. This patch also includes a note for Primative.

  Based on a patch by @vbatts via GH-436
  https://github.com/ruby/ruby/pull/436


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43666 b2dd03c8-39d4-4d8f-98ff-823fe69b080e