[temp.param] Fix typos (#7394)

Author: lprv

source/templates.tex

@@ -399,8 +399,8 @@
 \item
 all base classes and non-static data members are public and non-mutable and
 \item
-the types of all bases classes and non-static data members are
-structural types or (possibly multidimensional) array thereof.
+the types of all base classes and non-static data members are
+structural types or (possibly multidimensional) arrays thereof.
 \end{itemize}
 \end{itemize}