trivial: Remove another unused visibility spec (#201)

Identified by internal linter.
diff --git a/src/main/java/com/google/devtools/build/skydoc/rendering/BUILD b/src/main/java/com/google/devtools/build/skydoc/rendering/BUILD
index 014af3b..9e6a457 100644
--- a/src/main/java/com/google/devtools/build/skydoc/rendering/BUILD
+++ b/src/main/java/com/google/devtools/build/skydoc/rendering/BUILD
@@ -2,10 +2,7 @@
 
 package(
     default_applicable_licenses = ["//:license"],
-    default_visibility = [
-        "//src:__subpackages__",
-        "//stardoc:__subpackages__",
-    ],
+    default_visibility = ["//src:__subpackages__"],
 )
 
 filegroup(