Update docs/en/reference/basic-mapping.rst

Author: GromNaN

docs/en/reference/basic-mapping.rst

@@ -459,7 +459,7 @@ Date Fields
 MongoDB has a specific database type to store date and time values. You should never
 use a string to store a date. To define a date field, use the property types
 ``DateTime`` or ``DateTimeImmutable`` so that Doctrine maps it to a BSON date.
-The ``date`` and ``date_immutable`` mapping types can be used explicitly,
+The ``date`` and ``date_immutable`` mapping types can be used explicitly;
 they are required only if the property type is ``DateTimeInterface`` or not set.
 
 .. configuration-block::