doc: dead external link in fs.md
The link to http://www.linux.org/threads/intro-to-inodes.4130 added in #6099 seems to have linkrotted.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The link to http://www.linux.org/threads/intro-to-inodes.4130 added in #6099 seems to have linkrotted.