[Bazel] Followup: avoid dependency cycle

Author: akuegel

utils/bazel/llvm-project-overlay/clang-tools-extra/clang-doc/BUILD.bazel

@@ -36,7 +36,6 @@ cc_library(
     hdrs = glob(["*.h"]),
     includes = ["."],
     deps = [
-        ":clang-doc-support",
         "//clang:ast",
         "//clang:basic",
         "//clang:frontend",