beats: missing master reference

Author: v1v

conf.yaml

@@ -2164,7 +2164,7 @@ contents:
           - title:      Beats Developer Guide
             prefix:     en/beats/devguide
             index:      docs/devguide/index.asciidoc
-            current:    master
+            current:    main
             branches:   [ {main: master}, 8.0, 7.17, 7.16, 7.15, 7.14, 7.13, 7.12, 7.11, 7.10, 7.9, 7.8, 7.7, 7.6, 7.5, 7.4, 7.3, 7.2, 7.1, 7.0, 6.8, 6.7, 6.6, 6.5, 6.4, 6.3, 6.2, 6.1, 6.0 ]
             live:       *stacklivemain
             chunk:      1