Improve comments

src/backports/concepts.h

@@ -1,6 +1,6 @@
-//  Copyright 2024, University of Freiburg,
-//                  Chair of Algorithms and Data Structures.
-//  Author: Johannes Kalmbach <[email protected]>
+// Copyright 2024, University of Freiburg
+// Chair of Algorithms and Data Structures
+// Author: Johannes Kalmbach <[email protected]>
 
 #pragma once
 
@@ -10,23 +10,28 @@
 #endif
 
 // Define the following macros:
-// `QL_CONCEPT_OR_NOTHING(arg)` which expands to `arg` in C++20 mode, and to
+//
+// `QL_CONCEPT_OR_NOTHING(arg)`: expands to `arg` in C++20 mode, and to
 // nothing in C++17 mode. It can be used to easily opt out of concepts that are
 // only used for documentation and increased safety and not for overload
 // resolution.
 //
+// `QL_CONCEPT_OR_TYPENAME(arg)`: expands to `arg` in C++20 mode, and to
+// `typename` in C++17 mode. Example usage:
+//
 // Example usages:
+//
 // `QL_CONCEPT_OR_NOTHING(std::view) auto x = someFunction();`
-// `void f(QL_CONCEPT_OR_NOTHING(std::view) auto x) {...}`
 //
-// `QL_CONCEPT_OR_TYPENAME(arg)` which expands to `arg` in C++20 mode, and to
-// `typename` in C++17 mode.
+// `QL_CONCEPT_OR_NOTHING(SameAsAny<int, float>)`
+//
+// `void f(QL_CONCEPT_OR_NOTHING(std::view) auto x) {...}`
 //
-// Example usage:
 // `template <QL_CONCEPT_OR_TYPENAME(ql::same_as<int>) T> void f(){...}`
 //
-// Note: The macros are variadic to allow for commas in the argument (e.g.
-// `QL_CONCEPT_OR_NOTHING(SameAsAny<int, float>)`.
+// NOTE: The macros are variadic to allow for commas in the argument, like in
+// the second example above.
+
 #ifdef QLEVER_CPP_17
 #define QL_CONCEPT_OR_NOTHING(...)
 #define QL_CONCEPT_OR_TYPENAME(...) typename
@@ -39,10 +44,12 @@
 // C++20 standard as well as in `range-v3`.
 namespace ql {
 namespace concepts {
+
 #ifdef QLEVER_CPP_17
 using namespace ::concepts;
 #else
 using namespace std;
 #endif
+
 }  // namespace concepts
 }  // namespace ql