DOCS-14043 change field to notPrimaryUnacknowledgedWrites

Author: mungitoperrito

source/reference/command/serverStatus.txt

@@ -4007,7 +4007,7 @@ metrics
                "totalMillis" : <num>
             },
             "notMasterLegacyUnacknowledgedWrites" : <NumberLong>,
-            "notMasterUnacknowledgedWrites" : <NumberLong>,
+            "notPrimaryUnacknowledgedWrites" : <NumberLong>,
             "oplogGetMoresProcessed" : {
                "num" : <NumberLong>,
                "totalMillis" : <NumberLong>
@@ -4407,12 +4407,15 @@ metrics
 
    .. versionadded:: 4.2
 
-.. serverstatus:: metrics.repl.network.notMasterUnacknowledgedWrites
+.. serverstatus:: metrics.repl.network.notPrimaryUnacknowledgedWrites
 
    The number of unacknowledged (``w: 0``) write operations that failed
    because the current :binary:`~bin.mongod` is not in
    :replstate:`PRIMARY` state.
 
+   This field name was changed in MongoDB 4.4.3. Previously, this field
+   was named ``notMasterUnacknowledgedWrites``.
+
    .. versionadded:: 4.2
 
 .. serverstatus:: metrics.repl.network.oplogGetMoresProcessed