Clarify HapticEffect is not out on HapticService deprecation msg (#1023)

## Changes

<!-- Please summarize your changes. -->
Change deprecation notice in HapticService to clarify that HapticEffect
is not yet available, and set an alias so `Class.` is not visible but it
will still link to `HapticEffect` when it is added.

<!-- Please link to any applicable information (forum posts, bug
reports, etc.). -->
Report:
https://devforum.roblox.com/t/feedback-on-hapticservice/3466028/2
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Author: dgxo

content/en-us/reference/engine/classes/HapticService.yaml

@@ -24,9 +24,9 @@ tags:
   - Service
   - NotReplicated
 deprecation_message: |
-  This service has been superseded by `Class.HapticEffect`, a newer instance
-  that supports multiple haptic effect types, looped effects, and customizable
-  haptics.
+  This service will be superseded by `Class.HapticEffect|HapticEffect`, a newer
+  instance that will support multiple haptic effect types, looped effects, and
+  customizable haptics.
 properties: []
 methods:
   - name: HapticService:GetMotor