fix: update header comments for app.rake and dev.rake (#622)

While working on an internal app I realized we had an extra backtick in
the `app.rake` comment, and that lead me to realize our wording is a bit
ambiguous so I've updated both tasks to mirror each other

Author: G-Rath

variants/backend-base/lib/tasks/app.rake

@@ -2,8 +2,8 @@
 # The app namespace is for tasks which may be useful both in local development
 # and on deployed environments.
 #
-# If your task will be run in local development only you should choose the `dev`
-# namespace (see `dev.rake``)
+# if your tasks are intended to only be run in local development, you should
+# use the `dev` namespace (in `dev.rake`) instead
 #
 namespace :app do
   desc "Print (to STDOUT) count of records in DB for each ActiveRecord model"

variants/backend-base/lib/tasks/dev.rake

@@ -1,8 +1,8 @@
 ##
 # The dev namespace is for tasks which are intended for local development only.
 #
-# If your task could be run in local development or a deployed environment you
-# should choose the `app` namespace (see `app.rake`)
+# If your tasks are safe and could be useful to run in a deployed environment,
+# you should use the `app` namespace (in `app.rake`) instead
 
 ##
 # WARNING: Wrap `require` for development only gems in an environment check