Documentation: filesystems: update filename extensions

Update references to most txt files to rst files.
Update one reference to an md file to a rst file.
Update one file path to its current location.

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: [email protected]
Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: [email protected]
Cc: Ian Kent <[email protected]>
Cc: [email protected]
Cc: Alexander Aring <[email protected]>
Cc: David Teigland <[email protected]>
Cc: [email protected]
Cc: Eric Biggers <[email protected]>
Cc: Theodore Y. Ts'o <[email protected]>
Cc: [email protected]
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Joseph Qi <[email protected]>
Cc: [email protected]
Reviewed-by: Christian Brauner (Microsoft) <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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