(DOCSP-17440): fix build issue introduced in DOCSP-17440

Author: jwilliams-mongo

source/reference/operator/aggregation/getField.txt

@@ -65,8 +65,7 @@ Syntax
 
    * - ``input``
      - Object
-
-       *Default*: :variable:`$$CURRENT <CURRENT>`
+     - *Default*: :variable:`$$CURRENT <CURRENT>`
 
        A valid :ref:`expression <aggregation-expressions>` that 
        contains the ``field`` for which you want to return a value.