Merge branch '6.4' into 7.0

* 6.4:
  Add sleep to observe the changes in the terminal when executing the code.

Author: OskarStark

console.rst

@@ -319,19 +319,23 @@ method, which returns an instance of
 
             $section1->writeln('Hello');
             $section2->writeln('World!');
+            sleep(1);
             // Output displays "Hello\nWorld!\n"
 
             // overwrite() replaces all the existing section contents with the given content
             $section1->overwrite('Goodbye');
+            sleep(1);
             // Output now displays "Goodbye\nWorld!\n"
 
             // clear() deletes all the section contents...
             $section2->clear();
+            sleep(1);
             // Output now displays "Goodbye\n"
 
             // ...but you can also delete a given number of lines
             // (this example deletes the last two lines of the section)
             $section1->clear(2);
+            sleep(1);
             // Output is now completely empty!
 
             // setting the max height of a section will make new lines replace the old ones