Fixed typo in word avarege in result message of --intrinsic-latency analyzer

If you run the --intrinsic-latency analyzer you will get a output like:

```
$ redis-cli -p 6380 --intrinsic-latency 60
Max latency so far: 5 microseconds.
Max latency so far: 9 microseconds.
Max latency so far: 121 microseconds.
Max latency so far: 122 microseconds.

24586821 total runs (avg 2 microseconds per run).
Worst run took 61.00x times the avarege.
```

In this message the word "avarege" seems to got a typo. The correct word seems to be "average".
This PR will fix this.