Update the link

The link to ES's PHP API documentation is outdated but I don't have the rights to correct it myself.

Update https://www.elastic.co/guide/en/elasticsearch/client/php-api/6.0/_installation_2.html

to https://www.elastic.co/guide/en/elasticsearch/client/php-api/6.x/index.html

Dennis Groenewegen (talk)

We are embedding external content here. The change by freephile was merged. I believe we need to wait for it to propagate.

[[kgh]] (talk)

👍

Ah I see, the content gets cached for a while.

Dennis Groenewegen (talk)