doc: fix doubled word typo in stream_iter.md

PR-URL: https://github.com/nodejs/node/pull/62916
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Deokjin Kim <deokjin81.kim@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/stream_iter.md

@@ -1840,7 +1840,7 @@ console.log(ready); // Promise { true } -- no backpressure
 * Value: `Symbol.for('Stream.shareProtocol')`
 
 The value must be a function. When called by `Share.from()`, it receives the
-options passed to `Share.from()` and must return an object conforming the the
+options passed to `Share.from()` and must return an object conforming to the
 {Share} interface. The implementation is fully custom -- it can manage the shared
 source, consumers, buffering, and backpressure however it wants.