(DOCS-10329 & DOCS-10125): Improve getMore maxTimeMS description (#3771) (#4008)

* Improve getMore maxTimeMS description

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Author: cbullinger

source/reference/command/getMore.txt

@@ -67,11 +67,25 @@ The command accepts the following fields:
      - non-negative integer
      - Optional. 
 
-       The maximum amount of time MongoDB waits for new documents to be
-       added to the cursor for the current ``getMore`` command. If you
-       set ``maxTimeMS`` to 0, operations time out immediately. If 
-       unset, defaults to 1000 milliseconds.
+       Specifies the maximum time for the server to wait for new documents
+       that match a :ref:`tailable cursor <tailable-cursors-landing-page>`
+       query on a :ref:`capped collection <manual-capped-collection>`. 
+       ``maxTimeMS`` on a ``getMore`` for a tailable ``awaitData`` cursor is 
+       considered the same as :method:`~cursor.maxAwaitTimeMS()`.
+       Drivers will only set this value on ``getMore`` for a tailable 
+       cursor on a capped collection with ``awaitData`` set to ``true``. Otherwise, 
+       the command that creates the cursor sets ``maxTimeMS``, which 
+       is the maximum amount of time that the initial operation, and 
+       any subsequent ``getMore`` operations, can spend cumulatively executing 
+       the query. For tailable cursors with ``awaitData`` set to ``true``, 
+       the following is true:
 
+       - If no value is provided, the wait time defaults to ``1`` (1000 milliseconds).
+       - ``maxTimeMS`` on ``getMore`` specifies the maximum amount of time 
+         MongoDB waits for new documents to be inserted into the capped 
+         collection for that specific ``getMore`` command. 
+       - ``maxTimeMS`` is set individually by the driver for each call to ``getMore``.     
+
        MongoDB terminates operations that exceed their allotted time limit
        using the same mechanism as :method:`db.killOp()`. MongoDB only
        terminates an operation at one of its designated :term:`interrupt points <interrupt point>`.