Add redirects for broken API URLs (#99)

Author: jordan-smith721

config/redirects

@@ -70,3 +70,8 @@ raw: ${prefix}/stable -> ${base}/current/
 [v9.0-*]: ${prefix}/${version}/contributing/contributing-guidelines/ -> ${base}/${version}/issues-and-help/
 [v9.0-*]: ${prefix}/${version}/additional-resources/ -> ${base}/${version}/integrations-tools/external-resources/
 [v9.0-*]: ${prefix}/${version}/ecosystem/ -> ${base}/${version}/integrations-tools/external-resources/
+
+# Redirects for updated API pages
+[v9.0-*]: ${prefix}/${version}/api/Mongoid/Association/Referenced/NestedAttributes.html -> ${base}/${version}/api/Mongoid/Association/Referenced.html
+[*-master]: ${prefix}/${version}/api/Mongoid/Config/Introspection.html -> ${base}/${version}/api/Mongoid/Config.html
+[*-master]: ${prefix}/${version}/api/Mongoid/Config/Introspection/Option.html -> ${base}/${version}/api/Mongoid/Config.html