Fix typos in first_isvc.md (#394)

Update first_isvc.md

Signed-off-by: Eduardo Apolinario <[email protected]>

docs/get_started/first_isvc.md

@@ -1,7 +1,7 @@
 ## Run your first InferenceService
 
 In this tutorial, you will deploy an InferenceService with a predictor that will load a scikit-learn model trained with
-the [iris](https://archive.ics.uci.edu/ml/datasets/iris) dataset. This dataset has three output class: Iris Setosa, Iris Versicolour, and Iris Virginica.
+the [iris](https://archive.ics.uci.edu/ml/datasets/iris) dataset. This dataset has three output classes: Iris Setosa, Iris Versicolour, and Iris Virginica.
 
 You will then send an inference request to your deployed model in order to get a prediction for the class of iris plant your request corresponds to.
 
@@ -57,7 +57,7 @@ is provided as reference.
     ```
 !!! Warning
     Do not deploy `InferenceServices` in control plane namespaces (i.e. namespaces with `control-plane` label). The webhook is configured
-    in a way to skip these namespaces to avoid any privillage escalations. Deploying InferenceServices to these namespaces will result in the storage initializer not being 
+    in a way to skip these namespaces to avoid any privilege escalations. Deploying InferenceServices to these namespaces will result in the storage initializer not being 
     injected into the pod, causing the pod to fail with the error `No such file or directory: '/mnt/models'`.
 
 ### 3. Check `InferenceService` status.