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Original Description

Read concern documented here: https://docs.mongodb.com/v3.6/reference/read-concern/

On this page it says:
.bq Starting in MongoDB 3.6, "majority" read concern is always enabled, and this setting has no effect.

But the first page has no mention that "majority" is automatically enabled for replica sets starting in 3.6.
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Description

Bring the main read concern reference page into consistency with the read concern configuration option page.

Scope of changes (files that need work and how much)

https://docs.mongodb.com/v3.6/reference/read-concern/

Needs a mention of the fact that as of v3.6 read concern is always "majority".

Impact to other docs outside of this product

MVP (work and date?)

Resources (e.g. Scope Docs, Invision)