Fix typos

//! To generate a buffer with cryptographically strong bytes:

//!

//! ```

//! let muf buf = [0; 256]

//! let muf buf = [0; 256];

//! rand_bytes(&mut buf).unwrap();

//! ```

//!

use cvt;

use error::ErrorStack;

/// Fills buffer with cryptographically strong pseudo-random bytes.

/// Fill buffer with cryptographically strong pseudo-random bytes.

pub fn rand_bytes(buf: &mut [u8]) -> Result<(), ErrorStack> {

    unsafe {

        ffi::init();