doc: clarify fs.watch and inodes on linux, os x
Checklist
-
documentation is changed or added -
the commit message follows commit guidelines
Affected core subsystem(s)
doc
Description of change
On Linux and OS X systems, fs.watch resolves the watched path to an
inode. This clarifies that fs.watch watches the inode and not the
path. If the inode of the path subsequently changes, fs.watch will
continue watching the original inode and events for the path will no
longer be emitted. This is expected behavior.