docs: remove duplicate note

Author: kenjis

user_guide_src/source/dbmgmt/forge.rst

@@ -369,8 +369,6 @@ Class Reference
         :returns:    \CodeIgniter\Database\Forge instance (method chaining)
         :rtype:    \CodeIgniter\Database\Forge
 
-        .. note:: ``$fkName`` can be used since v4.3.0.
-
         Adds a foreign key to the set that will be used to create a table. Usage:  See `Adding Foreign Keys`_.
 
         .. note:: ``$fkName`` can be used since v4.3.0.