DOCS-11977: point to 3.6 docs for 3.6.1-3.6.x disable majority read concern for PSA architecture

Author: kay-kim

source/release-notes/3.6-upgrade-replica-set.txt

@@ -48,6 +48,22 @@ Before starting the upgrade, ensure that no initial sync is in
 progress. Performing the upgrade while an initial sync is in
 progress will cause the initial sync to restart.
 
+Read Concern Majority
+~~~~~~~~~~~~~~~~~~~~~
+
+Starting in MongoDB 3.6, MongoDB enables support for :v3.6:`"majority"
+</reference/read-concern-majority>` read concern by default.
+
+For MongoDB 3.6.1 - 3.6.x, you can disable read concern
+:v3.6:`"majority" </reference/read-concern-majority>` to prevent the
+storage cache pressure from immobilizing a deployment with a
+primary-secondary-arbiter (PSA) architecture. Disabling
+:v3.6:`"majority" </reference/read-concern-majority>` read concern also
+disables support for :v3.6:`change streams </changeStreams>`
+
+For more information, see :v3.6:`Disable Read Concern Majority
+</reference/read-concern-majority/#disable-read-concern-majority>`.
+
 Prerequisites
 -------------
 

source/release-notes/3.6-upgrade-sharded-cluster.txt

@@ -61,6 +61,22 @@ version of the sharded cluster to 3.6.
 
 For more information, see :issue:`SERVER-33763`.
 
+Read Concern Majority
+~~~~~~~~~~~~~~~~~~~~~
+
+Starting in MongoDB 3.6, MongoDB enables support for :v3.6:`"majority"
+</reference/read-concern-majority>` read concern by default.
+
+For MongoDB 3.6.1 - 3.6.x, you can disable read concern
+:v3.6:`"majority" </reference/read-concern-majority>` to prevent the
+storage cache pressure from immobilizing a deployment with a
+primary-secondary-arbiter (PSA) architecture. Disabling
+:v3.6:`"majority" </reference/read-concern-majority>` read concern also
+disables support for :v3.6:`change streams </changeStreams>`
+
+For more information, see :v3.6:`Disable Read Concern Majority
+</reference/read-concern-majority/#disable-read-concern-majority>`.
+
 Prerequisites
 -------------