docs: fix missing link to supported architectures (#5685)

Author: steinbro

docs/reference/architectures.rst

@@ -31,7 +31,7 @@ The platform name describes a ``build-on``/``build-for`` pairing. If the
 platform name is a valid debian architecture, then ``build-on`` and
 ``build-for`` can be omitted (see below for details).
 
-See here for a list of supported architectures.
+For a list of supported architectures, see :ref:`supported-architectures`.
 
 The recommended platform name is the ``build-for`` arch.
 
@@ -77,7 +77,7 @@ pairs with the following syntax:
       - build-on: [<arch 3>]
         build-for: [<arch 4>]
 
-See :ref:`here<supported-architectures>` for a list of supported architectures.
+For a list of supported architectures, see :ref:`supported-architectures`.
 
 Data types
 """"""""""