(#3169) - edit guide to changes

Now that I understand `last_seq` better, I understand
that it is not a footgun.

docs/_guides/changes.md

diff --git a/docs/_guides/changes.md b/docs/_guides/changes.md
index 83d2ada..01a7fb3 100644
--- a/docs/_guides/changes.md
+++ b/docs/_guides/changes.md
@@ -52,7 +52,7 @@
     if (changes.results.length < pageSize) {
       // done!
     } else {
-      lastSeq = changes.results[changes.results.length - 1].seq;
+      lastSeq = changes.last_seq;
       return fetchNextPage();
     }
   });
@@ -101,4 +101,4 @@
 Next
 -----
 
-Now that we know how to hook our data spigot to the changes feed, let's look into using the very powerful `query()` API.
\ No newline at end of file
+Now that we know how to hook our data spigot to the changes feed, let's look into using the very powerful `query()` API.