Fix up docs for `track_puppeted_user_ips` (again) (#11757)

Fixes #11741

changelog.d/11561.feature

@@ -1 +1 @@
-Add `track_puppeted_user_ips` config flag to track puppeted user IP addresses. This also includes them in monthly active user counts.
+Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts.

changelog.d/11749.feature

@@ -1 +1 @@
-Add `track_puppeted_user_ips` config flag to track puppeted user IP addresses. This also includes them in monthly active user counts.
+Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts.

changelog.d/11757.feature

@@ -0,0 +1 @@
+Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts.

docs/sample_config.yaml

@@ -1503,10 +1503,18 @@ room_prejoin_state:
    #additional_event_types:
    #  - org.example.custom.event.type
 
-# By default when puppeting another user, the user who has created the
-# access token for puppeting is tracked. If this is enabled, both
-# requests are tracked. Implicitly enables MAU tracking for puppeted users.
-# Uncomment to also track puppeted user IP's.
+# We record the IP address of clients used to access the API for various
+# reasons, including displaying it to the user in the "Where you're signed in"
+# dialog.
+#
+# By default, when puppeting another user via the admin API, the client IP
+# address is recorded against the user who created the access token (ie, the
+# admin user), and *not* the puppeted user.
+#
+# Uncomment the following to also record the IP address against the puppeted
+# user. (This also means that the puppeted user will count as an "active" user
+# for the purpose of monthly active user tracking - see 'limit_usage_by_mau' etc
+# above.)
 #
 #track_puppeted_user_ips: true
 

synapse/config/api.py

@@ -61,10 +61,18 @@ class ApiConfig(Config):
            #additional_event_types:
            #  - org.example.custom.event.type
 
-        # By default when puppeting another user, the user who has created the
-        # access token for puppeting is tracked. If this is enabled, both
-        # requests are tracked. Implicitly enables MAU tracking for puppeted users.
-        # Uncomment to also track puppeted user IP's.
+        # We record the IP address of clients used to access the API for various
+        # reasons, including displaying it to the user in the "Where you're signed in"
+        # dialog.
+        #
+        # By default, when puppeting another user via the admin API, the client IP
+        # address is recorded against the user who created the access token (ie, the
+        # admin user), and *not* the puppeted user.
+        #
+        # Uncomment the following to also record the IP address against the puppeted
+        # user. (This also means that the puppeted user will count as an "active" user
+        # for the purpose of monthly active user tracking - see 'limit_usage_by_mau' etc
+        # above.)
         #
         #track_puppeted_user_ips: true
         """ % {