[8.0.0] Mark cc_static_library as experimental in docs (#24012)

Closes #23800.

PiperOrigin-RevId: 684529045
Change-Id: I14dc53b6f2e39c7a05ee3a8b872eb220af45cef9

Commit
ed37f39

Co-authored-by: Fabian Meumertzheim <fabian@meumertzhe.im>

src/main/starlark/builtins_bzl/common/cc/experimental_cc_static_library.bzl

@@ -244,6 +244,9 @@ def _cc_static_library_impl(ctx):
 cc_static_library = rule(
     implementation = _cc_static_library_impl,
     doc = """
+<b>This rule is currently experimental and can only be used with the <code>
+--experimental_cc_static_library</code> flag.</b>
+
 Produces a static library from a list of targets and their transitive dependencies.
 
 <p>The resulting static library contains the object files of the targets listed in