fixup: added missing space after ==

Co-authored-by: Jan Schultke <[email protected]>

Author: dietmarkuehl

source/exec.tex

@@ -5833,7 +5833,7 @@
     template<class Sch>
       requires (!@\libconcept{same_as}@<task_scheduler, Sch>)
       && @\libconcept{scheduler}@<Sch>
-    friend bool operator== (const task_scheduler& lhs, const Sch& rhs) noexcept;
+    friend bool operator==(const task_scheduler& lhs, const Sch& rhs) noexcept;
 
   private:
     shared_ptr<void> @\exposidnc{sch_}@; // \expos