doc: remove "note that" from stream.md

PR-URL: #28329
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: Trott

doc/api/stream.md

@@ -1052,7 +1052,7 @@ readable.on('readable', () => {
 });
 ```
 
-Note that the `while` loop is necessary when processing data with
+The `while` loop is necessary when processing data with
 `readable.read()`. Only after `readable.read()` returns `null`,
 [`'readable'`]() will be emitted.