Remove a "do not use externally" warning from the BUILD file.

It's a legacy of Bazel's heritage as a Google internal project.

RELNOTES: None.
PiperOrigin-RevId: 253738804
diff --git a/src/main/java/com/google/devtools/build/lib/vfs/BUILD b/src/main/java/com/google/devtools/build/lib/vfs/BUILD
index ae2005e..6c70bb9 100644
--- a/src/main/java/com/google/devtools/build/lib/vfs/BUILD
+++ b/src/main/java/com/google/devtools/build/lib/vfs/BUILD
@@ -34,7 +34,6 @@
     ],
 )
 
-# Virtual file system; do not use externally!
 java_library(
     name = "vfs",
     srcs = glob(