clarify that the value is base64 encoded

Co-authored-by: Rey Lejano <rlejano@gmail.com>

content/en/docs/reference/kubectl/cheatsheet.md

@@ -177,7 +177,7 @@ kubectl get pods --selector=app=cassandra -o \
 kubectl get configmap myconfig \
   -o jsonpath='{.data.ca\.crt}'
 
-# Retrieve a value with dashes instead of underscores.
+# Retrieve a base64 encoded value with dashes instead of underscores.
 kubectl get secret my-secret --template='{{index .data "key-name-with-dashes"}}'
 
 # Get all worker nodes (use a selector to exclude results that have a label