PYTHON-3339 Ignore Sourceforge link that is giving 403 Error (#993)

Author: blink1073

doc/conf.py

@@ -82,11 +82,14 @@
 
 # Options for link checking
 # The anchors on the rendered markdown page are created after the fact,
-# so this link results in a 404.
+# so those link results in a 404.
+# wiki.centos.org has been flakey.
+# sourceforge.net is giving a 403 error, but is still accessible from the browser.
 linkcheck_ignore = [
     "https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-monitoring.rst#requesting-an-immediate-check",
     "https://github.com/mongodb/libmongocrypt/blob/master/bindings/python/README.rst#installing-from-source",
     r"https://wiki.centos.org/[\w/]*",
+    r"http://sourceforge.net/",
 ]
 
 # -- Options for extensions ----------------------------------------------------