Fix broken links (11/08/21) (#209)

* Fix broken links (11/08/21)

Author: Chris Cho

source/compatibility.txt

@@ -48,5 +48,5 @@ Apache Kafka platform that supports Kafka Connect.
 
 If you have any questions about the {+mkc+}, feel free to ask them on
 the `MongoDB Community Forums
-<https://www.mongodb.com/community/forums/c/connectors-integrations/>`__.
+<https://www.mongodb.com/community/forums/c/data/connectors-integrations/>`__.
 

source/source-connector/usage-examples/multiple-sources.txt

@@ -75,8 +75,8 @@ Additional Information
 ----------------------
 
 - The :manual:`$match aggregation operator </reference/operator/aggregation/match/>`
-- :manual:`MongoDB change events </change-events/>`
+- :manual:`MongoDB change events </reference/change-events/>`
 - :manual:`MongoDB namespace </reference/limits/#faq-dev-namespace>`
 - Regular expression syntax using the `Patterns class <https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html>`__
-- :manual:`</reference/operator/query/not/#-not-and-regular-expressions>`
+- :manual:`$not logical query operator and regular expressions </reference/operator/query/not/#-not-and-regular-expressions>`