[atomics.types.int] Remove superfluous whitespace (#8319)

Author: Andreas-Krug

source/threads.tex

@@ -5103,7 +5103,7 @@
                             memory_order = memory_order::seq_cst) noexcept;
     @\placeholdernc{integral-type}@ fetch_max(@\placeholdernc{integral-type}@,
                             memory_order = memory_order::seq_cst) volatile noexcept;
-    constexpr @\placeholdernc{integral-type}@ fetch_max( @\placeholdernc{integral-type}@,
+    constexpr @\placeholdernc{integral-type}@ fetch_max(@\placeholdernc{integral-type}@,
                             memory_order = memory_order::seq_cst) noexcept;
     @\placeholdernc{integral-type}@ fetch_min(@\placeholdernc{integral-type}@,
                             memory_order = memory_order::seq_cst) volatile noexcept;