Update src/pip/_internal/network/session.py

Author: bdraco

src/pip/_internal/network/session.py

@@ -355,7 +355,7 @@ def __init__(
             # is typically considered a transient error so we'll go ahead and
             # retry it.
             # A 500 may indicate transient error in Amazon S3
-            # A 502 may be a transient error from a CDN
+            # A 502 may be a transient error from a CDN like CloudFlare or CloudFront
             # A 520 or 527 - may indicate transient error in CloudFlare
             status_forcelist=[500, 502, 503, 520, 527],
             # Add a small amount of back off between failed requests in