VOTE: Solr Reference Guide for Solr 6.2

[Cassandra Targett]

At long last, please VOTE to release the Apache Solr Ref Guide for 6.2.

The artifacts can be downloaded from:
https://dist.apache.org/repos/dist/dev/lucene/solr/ref-guide/apache-solr-ref-guide-6.2-RC0/

$ more apache-solr-ref-guide-6.2-RC0/apache-solr-ref-guide-6.2.pdf.sha1
22f2dcdceb9ec69bb4de6dfb20e0c008850200dd  apache-solr-ref-guide-6.2.pdf

Here's my +1.

Thanks,
Cassandra