code: public java.lang.String getDeprecationDescription() {
      java.lang.Object ref = deprecationDescription_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        deprecationDescription_ = s;
        return s;
      }
    }
docs: <pre>
  Deprecation description of the selected element(s). It can be provided if an
  element is marked as `deprecated`.
  </pre>
  
  <code>string deprecation_description = 3;</code>