doc: dead external link in fs.md

[bnoordhuis]

The link to http://www.linux.org/threads/intro-to-inodes.4130 added in #6099 seems to have linkrotted.

[yorkie]

Suggest using wikipedia instead of that even though that would be available later: https://en.wikipedia.org/wiki/Inode

[suramya-shah]

made a PR waiting for it to get merged

[imyller]

PR #8940 merged without Fixes: meta. Closing manually.

[suramya-shah]

Thanks but @imyller why can I not see the merged label on my PR for the same ?

[addaleax]

@ss22ever Getting the purple “Merged” label is a bit tricky here, because we don’t use Github’s Merge button. If you want (and you have the “Allow edits from maintainers” checkbox checked), it should be possible, but that means that the collaborator who merges your PR has to push to your PR.