doc: minor correction to note on process section

PR-URL: #16311
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Nicu Micleușanu <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>

Author: danbev

doc/api/process.md

@@ -1634,7 +1634,7 @@ important ways:
    respectively.
 2. They cannot be closed ([`end()`][] will throw).
 3. They will never emit the [`'finish'`][] event.
-4. Writes may be synchronous depending on the what the stream is connected to
+4. Writes may be synchronous depending on what the stream is connected to
    and whether the system is Windows or POSIX:
    - Files: *synchronous* on Windows and POSIX
    - TTYs (Terminals): *asynchronous* on Windows, *synchronous* on POSIX