[tuple.helper, variant.helper] Change "specialization of *class*" to "specialization of *template*".

The containing lines were too long (cf. #693), and the change is a mild increase in pedantic correctness.

Author: tkoeppe

source/utilities.tex

@@ -2157,7 +2157,7 @@
 
 \begin{itemdescr}
 \pnum
-\remarks All specializations of \tcode{tuple_size<T>} shall meet the
+\remarks All specializations of \tcode{tuple_size} shall meet the
 \tcode{UnaryTypeTrait} requirements~(\ref{meta.rqmts}) with a
 base characteristic of \tcode{integral_constant<size_t, N>}
 for some \tcode{N}.
@@ -2172,10 +2172,10 @@
 \indexlibrary{\idxcode{tuple_element}}%
 \begin{itemdecl}
 template <size_t I, class... Types>
-class tuple_element<I, tuple<Types...>> {
-public:
-  using type = TI;
-};
+  class tuple_element<I, tuple<Types...>> {
+  public:
+    using type = TI;
+  };
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -4844,8 +4844,9 @@
 \begin{itemdescr}
 \pnum
 \remarks
-All specializations of \tcode{variant_size<T>} shall meet the
-\tcode{UnaryTypeTrait} requirements~(\ref{meta.rqmts}) with a base characteristic of \tcode{integral_constant<size_t, N>} for some \tcode{N}.
+All specializations of \tcode{variant_size} shall meet the
+\tcode{UnaryTypeTrait} requirements~(\ref{meta.rqmts})
+with a base characteristic of \tcode{integral_constant<size_t, N>} for some \tcode{N}.
 \end{itemdescr}
 
 \indexlibrary{\idxcode{variant_size}}%