Small Typos

This book is just what I was hoping for! Thank you for your hard work. 

ch 2 line 260 changed 'fuctions' to 'functions'
ch 2 line 261 changed 'a values' to 'values'

ch 3 line 486 changed 'wrapNumber' to 'wrapValue'   ( wrapNumber is not a function you defined in that section. )