Update regular filename reference in autotune files

[nemacysts]

We've generally decided that we'll be leaving files as eks-.yaml - and while there's some additional steps that need to be taken, those will need to happen once we've gotten rid of all of the kubernetes-.yaml files.

As we still have some unmigrated operators, that means we still need to wait. However, we can go ahead and update the comment in the autotune files since those have recently caused some confusion (and assume that anyone looking at autotune files is looking at them for non-operator services)

example diff:

--- a/yelp_eng_people/autotuned_defaults/kubernetes-pnw-corpdev.yaml
+++ b/yelp_eng_people/autotuned_defaults/kubernetes-pnw-corpdev.yaml
@@ -2,10 +2,10 @@
 # automated processes.
 #
 # Your service will use these values if they are not defined in
-# yelp_eng_people/kubernetes-pnw-corpdev.yaml.
+# yelp_eng_people/eks-pnw-corpdev.yaml.
 #
 # If you would like to override a config value defined here, add the config
-# value to yelp_eng_people/kubernetes-pnw-corpdev.yaml instead of editing this file.
+# value to yelp_eng_people/eks-pnw-corpdev.yaml instead of editing this file.