Redundant of removed.

Author: Karsten7

source/reference/operator/aggregation/toInt.txt

@@ -21,7 +21,7 @@ Definition
 
    .. versionadded:: 4.0
 
-   Converts a value of to an integer. If the value cannot be converted
+   Converts a value to an integer. If the value cannot be converted
    to an integer, :expression:`$toInt` errors. If the value is null or
    missing, :expression:`$toInt` returns null.