doc string update

Author: rakshil14-2

awscrt/aws_iot_metrics.py

@@ -414,10 +414,8 @@ def _create_metrics(user_metrics, crt_feature_list):
        IoTSDKMetricsVersion, IoTSDKFeature) are passed through unchanged.
 
     Args:
-        user_metrics : Metrics configuration from
-            the IoT SDK. May be None if no SDK-level metrics are provided.
-        crt_feature_list : Encoded CRT feature list string generated
-            by _get_encoded_feature_list or _get_encoded_feature_list_mqtt3.
+        user_metrics: Metrics configuration from the IoT SDK. May be None if no SDK-level metrics are provided.
+        crt_feature_list: Encoded CRT feature list string generated by _get_encoded_feature_list or _get_encoded_feature_list_mqtt3.
     Returns:
         AWSIoTMetrics: The final metrics object ready to be embedded in the
             MQTT CONNECT packet username field.

awscrt/io.py

@@ -19,12 +19,13 @@ class _CertificateSource(IntEnum):
     """Certificate source types for mTLS authentication.
 
     Used by TlsContextOptions to track which factory method created the
-    TLS configuration. The CRT reads this and encodes it as
+    TLS configuration. The metrics reads this and encodes it as
     feature ID "I" in the metrics string.
     """
     CERTIFICATE_FILES = 0  # PEM cert + key files
     PKCS11 = 1  # Hardware security module via PKCS11
-    WINDOWS_CERT_STORE = 2  # windows certificate source
+    WINDOWS_CERT_STORE = 2  # Windows certificate source
+    # 3 is reserved for Java keystore (not applicable to Python)
     PKCS12_FILE = 4  # PKCS#12 (.p12/.pfx) files