Use buildozer to remove deprecated automanaged tags

cmd/gendocs/BUILD

@@ -11,13 +11,11 @@ load(
 go_binary(
     name = "gendocs",
     library = ":go_default_library",
-    tags = ["automanaged"],
 )
 
 go_library(
     name = "go_default_library",
     srcs = ["gen_kubectl_docs.go"],
-    tags = ["automanaged"],
     deps = [
         "//cmd/genutils:go_default_library",
         "//pkg/kubectl/cmd:go_default_library",