Reinstate aysnc-clipboard commentary

Author: ddbeck

features/async-clipboard.yml

@@ -7,6 +7,8 @@ caniuse: async-clipboard
 # https://github.com/Fyrd/caniuse/pull/7106
 # https://github.com/Fyrd/caniuse/issues/7107
 group: clipboard
+# This feature's support history and data has been rather tangled. See:
+# https://github.com/web-platform-dx/web-features/issues/1249
 status:
   baseline: low
   baseline_low_date: 2024-06-11