docs(docs-infra): fix typo in tap into the observable tutorial example (angular#52359)

PR Close angular#52359

Author: Yvad60

aio/content/tutorial/tour-of-heroes/toh-pt6.md

@@ -179,7 +179,7 @@ Because each service method returns a different kind of `Observable` result, `ha
 
 ### Tap into the Observable
 
-The `getHeros()` method taps into the flow of observable values and sends a message, using the `log()` method, to the message area at the bottom of the page.
+The `getHeroes()` method taps into the flow of observable values and sends a message, using the `log()` method, to the message area at the bottom of the page.
 
 The RxJS `tap()` operator enables this ability by looking at the observable values, doing something with those values, and passing them along.
 The `tap()` callback doesn't access the values themselves.