Fix markdown references (attempt 2)

docs/Schema.md

@@ -27,7 +27,7 @@ You could see it as the main holder for Pod's data.
   Permanent delete will be supported in the future, based in deletion date.
 
 ### Item's additional properties
-Additional properties can be set dynamically via the [Schema API](./HTTP_API.md#schema_api).
+Additional properties can be set dynamically via the [Schema API](./HTTP_API.md#schema-api).
 
 
 ## Edges
@@ -43,7 +43,7 @@ Edges connect items together to form a
 
 ### Edge's additional properties
 Same as for items, additional properties can be set dynamically
-via the [Schema API](./HTTP_API.md#schema_api).
+via the [Schema API](./HTTP_API.md#schema-api).
 
 
 ### Understanding the schema