Merge pull request #4106 from faisne/patch-18

Fix small error in part11c.md

Author: vejol

src/content/11/en/part11c.md

@@ -52,7 +52,7 @@ Let's define some things we **want** in this hypothetical deployment system too:
  - We would like it to be fast
  - We'd like to have no downtime during the deployment (this is distinct from the requirement we have for handling user requests just before/during the deployment).
 
-Next we will have three sets of exercises for automating the deployment with GitHub Actions, one for [Fly.io](https://fly.io/), another one for [Render](https://render.com/). The process of deployment is always specific to the particular cloud provider, so you can also do both the exercise sets if you want to see the differences on how these services work with respect to deployments.
+Next we will have two sets of exercises for automating the deployment with GitHub Actions, one for [Fly.io](https://fly.io/), another one for [Render](https://render.com/). The process of deployment is always specific to the particular cloud provider, so you can also do both the exercise sets if you want to see the differences on how these services work with respect to deployments.
 
 ### Has the app been deployed?