Update tests/zero-downtime-scaling/zero-downtime-scaling.md

Co-authored-by: bjee19 <139261241+bjee19@users.noreply.github.com>

tests/zero-downtime-scaling/zero-downtime-scaling.md

@@ -78,7 +78,7 @@ The rest of the test environment is the same for both cases:
 Notes:
 
 - For sending traffic, we will use both wrk and curl.
-  - *wrk* will generate a lot of traffic continuously, and it will have a high chance of catching of any
+  - *wrk* will generate a lot of traffic continuously and it will have a high chance of catching any
     (however small) periods of downtime.
   - *curl* will generate 1 request every 0.1s. While it might not catch small periods of downtime, it will give us
     timeline of failed request for big periods of downtime, which wrk doesn't do.