[expected.void.cons] Fix indentation (#7806)

Author: Andreas-Krug

source/utilities.tex

@@ -9164,7 +9164,7 @@
 \indexlibraryctor{expected<void>}%
 \begin{itemdecl}
 template<class U, class... Args>
-    constexpr explicit expected(unexpect_t, initializer_list<U> il, Args&&... args);
+  constexpr explicit expected(unexpect_t, initializer_list<U> il, Args&&... args);
 \end{itemdecl}
 
 \begin{itemdescr}