doc: clarify FileHandle text

There is a paragraph about why the promise-based API uses `FileHandle`
rather than a numeric `fd`. Unfortunately, the paragraph is a bit of
word-salad. Edit it for clarity, grammar, and style.

PR-URL: #20450
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: James M Snell <[email protected]>

doc/api/fs.md

@@ -3378,11 +3378,11 @@ and will emit a process warning, thereby helping to prevent memory leaks.
 Instances of the `FileHandle` object are created internally by the
 `fsPromises.open()` method.
 
-Unlike callback-based such as `fs.fstat()`, `fs.fchown()`, `fs.fchmod()`,
-`fs.ftruncate()`, `fs.read()`, and `fs.write()`, operations — all of which
-use a simple numeric file descriptor, all `fsPromises.*` variations use the
-`FileHandle` class in order to help protect against accidental leaking of
-unclosed file descriptors after a `Promise` is resolved or rejected.
+Unlike the callback-based API (`fs.fstat()`, `fs.fchown()`, `fs.fchmod()`, and
+so on), a numeric file descriptor is not used by the promise-based API. Instead,
+the promise-based API uses the `FileHandle` class in order to help avoid
+accidental leaking of unclosed file descriptors after a `Promise` is resolved or
+rejected.
 
 #### filehandle.appendFile(data, options)
 <!-- YAML