document web support in ownCloud 10 server

[phil-davis]

WHAT Needs to be Documented?

The latest web is not supported with ownCloud 10 server.
Document what is the latest version of web that supports ownCloud 10 server.
(and check that the version is the one that the market place/app store provides to ownCloud 10)

WHERE Does This Need To Be Documented (Link)?

https://github.com/owncloud/docs-webui/blob/master/modules/owncloud_web/pages/web_with_oc_server.adoc

WHY Should This Change Be Made?

People who try to use web with ownCloud 10 server need to be better aware of this.

(Optional) What Type Of Content Change Is This?

• New Content Addition
• Old Content Deprecation
• Existing Content Simplification
• Bug Fix to Existing Content

(Optional) Which Manual Does This Relate To?

• Admin Manual
• Developer Manual
• User Manual
• Android
• iOS
• Branded Clients
• Desktop Client
• Other