Merge pull request #1088 from segmentio/dj/doc1

samesite explanation

Author: danieljackins

src/connections/sources/catalog/libraries/website/javascript/troubleshooting.md

@@ -103,6 +103,15 @@ console.log(JSON.stringify({ x: undefined, y: 6 }));
 // expected output: "{"y":6}"
 ```
 
+## Why am I seeing a "SameSite" warning? 
+
+If you see a warning like the following, it could have one of several causes:
+"A cookie associated with a cross-site resource at http://segment.com/ was set without the `SameSite` attribute [...]"
+
+Segment correctly sets cookies with the 'SameSite' attribute with Analytics.js. 
+
+If you see this warning, it is because you previously visited http://segment.com, and are getting the warning due to unrelated cookies. To verify that this is the issue, visit your page in Incognito Mode and confirm that the warning no longer occurs. Your users won't see this warning unless they _also_  visited http://segment.com.
+
 
 ### Can I overwrite the context fields?