DOCSP-2557: add changeStream action to read role

Author: skerschb

source/reference/built-in-roles.txt

@@ -52,6 +52,7 @@ Every database includes the following client roles:
    The role provides read access by granting the following :ref:`actions
    <security-user-actions>`:
 
+   - :authaction:`changeStream`
    - :authaction:`collStats`
    - :authaction:`dbHash`
    - :authaction:`dbStats`

source/reference/method/Mongo.watch.txt

@@ -87,6 +87,9 @@ have a :ref:`role <roles>` that grants the following :ref:`privilege
 
    { resource: { db: "", collection: "" }, actions: [ "find", "changeStream" ] }
 
+The built-in :authrole:`read` role provides the appropriate
+privileges.
+
 Example
 -------
 

source/reference/method/db.collection.watch.txt

@@ -83,6 +83,10 @@ have a :ref:`role <roles>` that grants the following :ref:`privilege
 
    { resource: { db: <dbname>, collection: <collection> }, actions: [ "find", "changeStream" ] }
 
+
+The built-in :authrole:`read` role provides the appropriate
+privileges.
+
 Examples
 --------
 

source/reference/method/db.watch.txt

@@ -91,6 +91,9 @@ have a :ref:`role <roles>` that grants the following :ref:`privilege
 .. code-block:: javascript
 
    { resource: { db: <dbname>, collection: "" }, actions: [ "find", "changeStream"] }
+
+The built-in :authrole:`read` role provides the appropriate
+privileges.
 
 Example
 -------