PYTHON-5336 Added VECTOR_SUBTYPE line to API docs (#2313)

(cherry picked from commit 2ebd2aa)

Author: caseyclements

doc/api/bson/binary.rst

@@ -16,6 +16,7 @@
    .. autodata:: MD5_SUBTYPE
    .. autodata:: COLUMN_SUBTYPE
    .. autodata:: SENSITIVE_SUBTYPE
+   .. autodata:: VECTOR_SUBTYPE
    .. autodata:: USER_DEFINED_SUBTYPE
 
    .. autoclass:: UuidRepresentation