Added logo to Upgrade docs for 3.6.0 CTR
Added logo to Upgrade docs for 3.6.0 CTR

apache/tinkerpop,apache/tinkerpop,apache/incubator-tinkerpop,apache/tinkerpop,apache/incubator-tinkerpop,apache/tinkerpop,apache/tinkerpop,apache/tinkerpop,apache/incubator-tinkerpop,apache/tinkerpop