Update TS-MIGRATION.md

doc/TS-MIGRATION.md

@@ -1,10 +1,4 @@
-# Typescript migration
- 
-## Introduce `abstract` & `override`
-
- - find all methods and getters that throw or are empty in base classes and turn into abstract method or if all methods are abstract, into an interface.
- - change child impls to not call super.method and to add override
- - don't allow implicit override in ts config
+# Typescript style guide
 
 ## Use `type` rather than `interface` for named parameters and POJO return values.