Update README.md (#245)

hooks/AppSync_BreakingChangeDetection/README.md

@@ -2,7 +2,7 @@
 
 Validates that an AWS AppSync GraphQL schema update does not introduce a change that would break existing clients of the AWS AppSync GraphQL API. There are three categories of changes in a GraphQL schema:
 
-- **Breaking**: These are changes that are not backwards incompatible for existing API clients, such as changing the return type of an existing field or removing a field from the schema.
+- **Breaking**: These are changes that are backwards incompatible for existing API clients, such as changing the return type of an existing field or removing a field from the schema.
 - **Dangerous**: These are changes that may be dangerous for existing API clients but are not necessarily breaking, such as adding a new value in an Enum or changing the default value on an argument.
 - **Non-breaking**: These are changes that are backwards compatible for existing clients, such as adding a new field or type to the schema.
 
@@ -174,4 +174,4 @@ Resources:
              SIMPLE,
              COMPLEX
           }
-```
+```