Update fastapi_configuration.mdx

Author: semyonsh

docs/docs/b2c/fastapi_configuration.mdx

@@ -238,12 +238,12 @@ class Settings(BaseSettings):
     @computed_field
     @property
     def OPENAPI_AUTHORIZATION_URL(self) -> dict:
-        return f'https://{settings.TENANT_NAME}.b2clogin.com/{settings.TENANT_NAME}.onmicrosoft.com/{settings.AUTH_POLICY_NAME}/oauth2/v2.0/authorize'
+        return f'https://{self.TENANT_NAME}.b2clogin.com/{self.TENANT_NAME}.onmicrosoft.com/{self.AUTH_POLICY_NAME}/oauth2/v2.0/authorize'
 
     @computed_field
     @property
     def OPENAPI_TOKEN_URL(self) -> dict:
-        return f'https://{settings.TENANT_NAME}.b2clogin.com/{settings.TENANT_NAME}.onmicrosoft.com/{settings.AUTH_POLICY_NAME}/oauth2/v2.0/token'
+        return f'https://{self.TENANT_NAME}.b2clogin.com/{self.TENANT_NAME}.onmicrosoft.com/{self.AUTH_POLICY_NAME}/oauth2/v2.0/token'
 
     model_config = SettingsConfigDict(
         env_file='.env',