Fixed the formatting in all blocks of code (#34095)

* Fixed the formatting in all blocks of code

* Update index.md

guide/english/cplusplus/do-while-loop/index.md

@@ -6,8 +6,7 @@ This is just like the `while` and `for` loop but the only difference is that the
 
 The `do while` loop has the following form:
 ```cpp
-do 
-{
+do {
   // do something;	
 } while(condition);
 	
@@ -24,7 +23,7 @@ Do something first and then test if we have to continue. The result is that the
 
 
 ```cpp
-#include <iostream.h>
+#include <iostream>
 using namespace std;
 
 int main()
@@ -33,12 +32,10 @@ Do something first and then test if we have to continue. The result is that the
 
   cin >> howmuch;
   counter = 0;
-		do
-		{
+  do {
     counter++;
     cout << counter << '\n';
-		}
-		while ( counter < howmuch);
+  } while (counter < howmuch);
   return 0;
 }
 ```