Updated Coding style (markdown)

Coding-style.md

@@ -94,7 +94,7 @@ private:
     int class_member_;
 };
 ```
-* Operators: around all binary operators there always should be one space.
+* Operators: around all binary operators there always should be spaces.
 ```
 int x = 5;
 x = x * 5 / 5;