docs: tweak new README entry

Author: dbanty

README.md

@@ -127,10 +127,7 @@ package_name_override: my_extra_special_package_name
 
 ### field_prefix
 
-When generating properties, the `name` attribute of the OpenAPI schema will be used. When the `name` is not a valid
-Python identifier (e.g. begins with a number) this string will be prepended. Defaults to "field\_".
-It will also be used to prefix fields in schema starting with "_" in order to avoid
-ambigous semantics.
+When generating properties, the `name` attribute of the OpenAPI schema will be used. When the `name` is not a valid Python identifier (e.g. begins with a number) this string will be prepended. Defaults to "field\_". It will also be used to prefix fields in schema starting with "_" in order to avoid ambiguous semantics.
 
 Example: