lib+mm: fix few spelling mistakes

 *

 *   \Sum_{j} p_{j} = 1,

 *

 * This formula can be straightforwardly computed by maintaing denominator

 * This formula can be straightforwardly computed by maintaining denominator

 * (let's call it 'd') and for each event type its numerator (let's call it

 * 'n_j'). When an event of type 'j' happens, we simply need to do:

 *   n_j++; d++;

 * particular cpu can (and will) wrap - this is fine, when we go to shutdown the

 * percpu counters will all sum to the correct value

 *

 * (More precisely: because moduler arithmatic is commutative the sum of all the

 * (More precisely: because modular arithmetic is commutative the sum of all the

 * percpu_count vars will be equal to what it would have been if all the gets

 * and puts were done to a single integer, even if some of the percpu integers

 * overflow or underflow).

/*

 * balloon_page_enqueue - allocates a new page and inserts it into the balloon

 *			  page list.

 * @b_dev_info: balloon device decriptor where we will insert a new page to

 * @b_dev_info: balloon device descriptor where we will insert a new page to

 *

 * Driver must call it to properly allocate a new enlisted balloon page

 * before definetively removing it from the guest system.

 * before definitively removing it from the guest system.

 * This function returns the page address for the recently enqueued page or

 * NULL in the case we fail to allocate a new page this turn.

 */