Update deprecation-template.md (#419)

* Update deprecation-template.md

* Update deprecation-template.md

deprecation-template.md

@@ -2,50 +2,48 @@
 - RFC PR: (leave this empty)
 - Ember Issue: (leave this empty)
 
-# Summary
+# <RFC title>
+
+## Summary
 
-One paragraph explanation of the deprecation.
+> One paragraph explanation of the deprecation.
 
-# Motivation
+## Motivation
 
-Why are we doing this? What are the problems with the deprecated feature?
+> Why are we doing this? What are the problems with the deprecated feature?
 What is the replacement functionality?
 
-# Transition Path
-
-This is the bulk of the RFC. Explain the use-cases that deprecated functionality
-covers, and for each use-case, describe the transition path.
+## Transition Path
 
+> This is the bulk of the RFC. Explain the use-cases that deprecated functionality
+covers, and for each use-case, describe the transition path.  
 Describe it in enough detail for someone who uses the deprecated functionality
 to understand, for someone to write the deprecation guide, and for someone
 familiar with the implementation to implement.
 
-# How We Teach This
+## How We Teach This
 
-Would the acceptance of this proposal mean the Ember guides must be
+> Would the acceptance of this proposal mean the Ember guides must be
 re-organized or altered? Does it change how Ember is taught to new users
-at any level?
-
+at any level?  
 Does it mean we need to put effort into highlighting the replacement
 functionality more? What should we do about documentation, in the guides
-related to this feature?
-
+related to this feature?  
 How should this deprecation be introduced and explained to existing Ember
 users?
 
-# Drawbacks
+## Drawbacks
 
-Why should we *not* do this? Please consider the impact on teaching Ember,
+> Why should we *not* do this? Please consider the impact on teaching Ember,
 on the integration of this feature with other existing and planned features,
-on the impact of the API churn on existing apps, etc.
-
+on the impact of the API churn on existing apps, etc.  
 There are tradeoffs to choosing any path, please attempt to identify them here.
 
-# Alternatives
+## Alternatives
 
-What other designs have been considered? What is the impact of not doing this?
+> What other designs have been considered? What is the impact of not doing this?
 
-# Unresolved questions
+## Unresolved questions
 
-Optional, but suggested for first drafts. What parts of the design are still
+> Optional, but suggested for first drafts. What parts of the design are still
 TBD?