Typos in const reference page

https://www.arduino.cc/en/Reference/Const

Change:
>This, and the pitfalls of using#define

to:
>This, and the pitfalls of **using #define**

Change:
>x = pi * 2;    // it's fine to use const's in math

to:
>x = pi * 2;    // it's fine to use **consts** in math