472fe8a2ce
d8c4998f31 Fix typos (practicalswift)
Pull request description:
Fix typos.
Tree-SHA512: 9af52a9799e6892b162e4aa1bcd6585502e10650b8aced59e7346dbb2f08544330081eb79328255fad1d358c095507956e049d354c4383b6965d4d5a7d635425