message: remove template doc for new schema
diff: ## Design considerations
  -
  ## Naming considerations
  -
  ## Classes
  ## Relationships
  @@ -20,7 +18,7 @@ CodeValue|NULL
  CodeScope|CodeScopeSpec::Repository
  CodeSpec|bis:NullCodeSpec
  -## iModel Bridges using SpatialComposition
  +## iModel Bridges using ClassificationSystems
  Bridges that do not store `SpatialComposition` relationships natively, may compute and maintain those in their bridge. In the long run it is not sure if the tradeoff of storing and maintaining the persistance of relationships outweighs the performance loss of computing them each time. However a future domain handler API may elect to compute them (as bim software grows more mature).
  