[spec] Fix naming typo (#1532)

Author: whirlicote

document/core/exec/modules.rst

@@ -313,7 +313,7 @@ New instances of :ref:`functions <syntax-funcinst>`, :ref:`tables <syntax-tablei
 
 2. Let :math:`a` be the first free :ref:`element address <syntax-elemaddr>` in :math:`S`.
 
-3. Let :math:`\eleminst` be the :ref:`element instance <syntax-eleminst>` :math:`\{ \EITYPE~t, \EIELEM~\reff^\ast \}`.
+3. Let :math:`\eleminst` be the :ref:`element instance <syntax-eleminst>` :math:`\{ \EITYPE~\reftype, \EIELEM~\reff^\ast \}`.
 
 4. Append :math:`\eleminst` to the |SELEMS| of :math:`S`.