Update exception msg

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

Author: sfc-gh-mayliu

src/snowflake/snowpark/secrets.py

@@ -158,13 +158,15 @@ def get_username_password(self, secret_name: str) -> UsernamePassword:
         password = self._read_scls_spcs_secret_file(secret_name, "password")
         return UsernamePassword(username, password)
 
+
     def get_cloud_provider_token(self, secret_name: str) -> CloudProviderToken:
         # SPCS container currently does not support cloud provider token secrets
         raise NotImplementedError(
-            "Cannot import _snowflake module. get_cloud_provider_token is only supported on Snowflake server environment."
+            "Cloud provider token secrets are not supported in SPCS container environments."
         )
 
 
+
 def _is_spcs_environment() -> bool:
     return os.getenv(SCLS_SPCS_SECRET_ENV_NAME, None) is not None