I wasn't sure because this never bothered me so I did a little experiment by searching for

"does it warn about mispellings"

(Note the intentional misspelling above.)

And here is the result:

  We haven’t found anything.
  There are no results that match all your keywords exactly.
  Check your spelling, try different keywords, or try without quotes:
  does it warn about mispellings

Edit: I then tried to repeat the experiment with only one misspelled word which was harder because misspelled is misspelled in several different ways across the web, so the first most realistic misspellings actually returned real results.

When I came as far as "mixspeling" however it came back with the same result as the one I pasted in above.