(DOCSP-46424) Add undocumented settings (#668) (#799)

[JIRA](https://jira.mongodb.org/browse/DOCSP-46424)
[Staging]()

Author: lmkerbey-mdb

source/includes/setting-uiConf-idle-session-timeout-max-minutes.rst

@@ -0,0 +1,14 @@
+.. setting:: Idle Session Timeout Max Minutes
+
+   *Type*: int
+
+   *Default*: None
+
+   The maximum time, in minutes, a session remains open with no user
+   activity. After this time elapses without user activity, |mms| logs
+   the user out.
+
+   You must set :setting:`Idle Session Timeout Mode` in order to use
+   this setting.
+   
+   Corresponds to :setting:`mms.session.idleTimeoutMinutes`.

source/includes/setting-uiConf-idle-session-timeout-mode.rst

@@ -0,0 +1,15 @@
+.. setting:: Idle Session Timeout Mode
+
+   *Type*: string
+
+   *Default*: None
+
+   Mode of the idle session timeout feature.
+
+   Set to ``"idle"`` to allow |mms| to log out users after a period of
+   inactivity.
+
+   The duration of this period of inactivity is determined by the
+   :setting:`Idle Session Timeout Max Minutes`.
+   
+   Corresponds to :setting:`mms.session.mode`.

source/includes/setting-uiConf-recaptcha-enabled.rst

@@ -3,9 +3,8 @@
    *Type*: boolean
 
    *Default*: false
-
 
-   Indicator as to you want a user to validate themselves using
+   Requirement for users to validate themselves with
    reCaptcha validation when they log into |mms|.
 
    Set to ``true`` to require