blog/execution-traces-2024: fix spelling error in example

Change-Id: Id7cc0fbfc133ac6f1e2927241b794c665e5f66f3
Reviewed-on: https://go-review.googlesource.com/c/website/+/571855
Reviewed-by: Cherry Mui <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: kevinburke

_content/blog/execution-traces-2024/flightrecorder.go

@@ -29,7 +29,7 @@ func main() {
 
 		// We saw a long request. Take a snapshot!
 		if time.Since(start) > 300*time.Millisecond {
-			// Do it only once for simplicitly, but you can take more than one.
+			// Do it only once for simplicity, but you can take more than one.
 			once.Do(func() {
 				// Grab the snapshot.
 				var b bytes.Buffer