Correct is clock struct example

Rageking8 · web-flow · commit d10b38d268e0 · 2024-01-01T01:48:55.000+08:00
diff --git a/docs/standard-library/is-clock-struct.md b/docs/standard-library/is-clock-struct.md
@@ -50,14 +50,13 @@ The following code works because `is_clock`, derives from `Cpp17UnaryTypeTrait`,
 #include <iostream>
 #include <chrono>
 
-using namespace `std::chrono`;
+using namespace std::chrono;
 
 int main()
 {
     is_clock<system_clock> ic;
 
     std::cout << std::boolalpha << ic.value << ", " << ic() << ", " << (bool)ic;
-    return 0;
 }
 ```
 

Original file line number	Diff line number	Diff line change
@@ -50,14 +50,13 @@ The following code works because `is_clock`, derives from `Cpp17UnaryTypeTrait`,
`50`	`50`	`#include <iostream>`
`51`	`51`	`#include <chrono>`
`52`	`52`
`53`		-using namespace `std::chrono`;
	`53`	`+using namespace std::chrono;`
`54`	`54`
`55`	`55`	`int main()`
`56`	`56`	`{`
`57`	`57`	`is_clock<system_clock> ic;`
`58`	`58`
`59`	`59`	`std::cout << std::boolalpha << ic.value << ", " << ic() << ", " << (bool)ic;`
`60`		`- return 0;`
`61`	`60`	`}`
`62`	`61`	```
`63`	`62`