Update fastapi_configuration.mdx

Fix references and return types in B2C doc

docs/docs/b2c/fastapi_configuration.mdx

@@ -232,17 +232,17 @@ class Settings(BaseSettings):
 
     @computed_field
     @property
-    def OPENID_CONFIG_URL(self) -> dict:
+    def OPENID_CONFIG_URL(self) -> str:
         return f'https://{self.TENANT_NAME}.b2clogin.com/{self.TENANT_NAME}.onmicrosoft.com/{self.AUTH_POLICY_NAME}/v2.0/.well-known/openid-configuration'
 
     @computed_field
     @property
-    def OPENAPI_AUTHORIZATION_URL(self) -> dict:
+    def OPENAPI_AUTHORIZATION_URL(self) -> str:
         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:
+    def OPENAPI_TOKEN_URL(self) -> str:
         return f'https://{self.TENANT_NAME}.b2clogin.com/{self.TENANT_NAME}.onmicrosoft.com/{self.AUTH_POLICY_NAME}/oauth2/v2.0/token'
 
     model_config = SettingsConfigDict(
@@ -334,18 +334,18 @@ class Settings(BaseSettings):
 
     @computed_field
     @property
-    def OPENID_CONFIG_URL(self) -> dict:
+    def OPENID_CONFIG_URL(self) -> str:
         return f'https://{self.TENANT_NAME}.b2clogin.com/{self.TENANT_NAME}.onmicrosoft.com/{self.AUTH_POLICY_NAME}/v2.0/.well-known/openid-configuration'
 
     @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'
+    def OPENAPI_AUTHORIZATION_URL(self) -> str:
+        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'
+    def OPENAPI_TOKEN_URL(self) -> str:
+        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',
@@ -440,18 +440,18 @@ class Settings(BaseSettings):
 
     @computed_field
     @property
-    def OPENID_CONFIG_URL(self) -> dict:
+    def OPENID_CONFIG_URL(self) -> str:
         return f'https://{self.TENANT_NAME}.b2clogin.com/{self.TENANT_NAME}.onmicrosoft.com/{self.AUTH_POLICY_NAME}/v2.0/.well-known/openid-configuration'
 
     @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'
+    def OPENAPI_AUTHORIZATION_URL(self) -> str:
+        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'
+    def OPENAPI_TOKEN_URL(self) -> str:
+        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',