(DOCSP-52910) Fix $emit docs (#14081)

Author: lmkerbey-mdb

content/atlas/source/atlas-stream-processing/sp-agg-emit.txt

@@ -57,7 +57,7 @@ pipeline stage with the following prototype form:
          "dateFormat": "default" | "ISO8601",
          "headers": "<expression>",
          "key": "<key-string>" | { key-document },
-         "keyFormat": "<deserialization-type>",
+         "keyFormat": "<serialization-type>",
          "outputFormat": "<json-format>",
          "tombstoneWhen": <expression>
        }
@@ -139,15 +139,15 @@ The ``$emit`` stage takes a document with the following fields:
 
           { "flightTime" :  ISODate('2025-01-10T20:17:38.387Z') }
 
-       If ``$emit.config.defaultFormat`` is set to ``default``,
+       If ``$emit.config.dateFormat`` is set to ``default``,
        output looks similar to the following:
 
        .. code-block:: shell 
           :copyable: false
 
           { "flightTime" :  {$date :"2025-01-10T20:17:38.387Z"}}
 
-       If ``$emit.config.defaultFormat`` is set to ``ISO8601``,
+       If ``$emit.config.dateFormat`` is set to ``ISO8601``,
        output looks similar to the following:
 
        .. code-block:: shell
@@ -199,7 +199,7 @@ The ``$emit`` stage takes a document with the following fields:
    * - ``config.keyFormat``
      - string
      - Conditional
-     - Data type used to deserialize {+kafka+} key data. Must be one
+     - Data type used to serialize {+kafka+} key data. Must be one
        of the following values:
 
        - ``"binData"``
@@ -210,7 +210,7 @@ The ``$emit`` stage takes a document with the following fields:
 
        Defaults to ``binData``. If you specify ``config.key``, you
        must specify ``config.keyFormat``. If the ``config.key`` of a
-       document does not deserialize successfully to the specified
+       document does not serialize successfully to the specified
        data type, {+atlas-sp+} sends it to your :ref:`dead letter
        queue <atlas-sp-dlq>`.
 
@@ -486,15 +486,15 @@ The ``$emit`` stage takes a document with the following fields:
 
           { "flightTime" :  ISODate('2025-01-10T20:17:38.387Z') }
 
-       then if ``$emit.config.defaultFormat`` is set to ``default``,
+       then if ``$emit.config.dateFormat`` is set to ``default``,
        output looks similar to the following:
 
        .. code-block:: shell 
           :copyable: false
 
           { "flightTime" :  {$date :"2025-01-10T20:17:38.387Z"}}
 
-       If ``$emit.config.defaultFormat`` is set to ``ISO8601``,
+       If ``$emit.config.dateFormat`` is set to ``ISO8601``,
        output looks similar to the following:
 
        .. code-block:: shell