docs: remove redundant whitespaces and fix minor typos (#33422)

PR Close #33422

aio/content/guide/observables.md

@@ -13,7 +13,7 @@ Because of these advantages, observables are used extensively within Angular, an
 
 As a publisher, you create an `Observable` instance that defines a *subscriber* function. This is the function that is executed when a consumer calls the `subscribe()` method. The subscriber function defines how to obtain or generate values or messages to be published.
 
-To execute the observable you have created and begin receiving notifications, you call its `subscribe()` method, passing an *observer*.  This is a JavaScript object that defines the handlers for the notifications you receive. The `subscribe()` call returns a `Subscription` object that has an `unsubscribe()` method, which you call to stop receiving notifications.
+To execute the observable you have created and begin receiving notifications, you call its `subscribe()` method, passing an *observer*. This is a JavaScript object that defines the handlers for the notifications you receive. The `subscribe()` call returns a `Subscription` object that has an `unsubscribe()` method, which you call to stop receiving notifications.
 
 Here's an example that demonstrates the basic usage model by showing how an observable could be used to provide geolocation updates.
 
@@ -77,13 +77,13 @@ Now you can use this function to create an observable that publishes keydown eve
 
 ## Multicasting
 
-A typical observable creates a new, independent execution for each subscribed observer. When an observer subscribes, the observable wires up an event handler and delivers values to that observer. When a second observer subscribes, the observable then wires up a new event handler and delivers values to that second observer in a separate execution. 
+A typical observable creates a new, independent execution for each subscribed observer. When an observer subscribes, the observable wires up an event handler and delivers values to that observer. When a second observer subscribes, the observable then wires up a new event handler and delivers values to that second observer in a separate execution.
 
 Sometimes, instead of starting an independent execution for each subscriber, you want each subscription to get the same values—even if values have already started emitting. This might be the case with something like an observable of clicks on the document object.
 
 *Multicasting* is the practice of broadcasting to a list of multiple subscribers in a single execution. With a multicasting observable, you don't register multiple listeners on the document, but instead re-use the first listener and send values out to each subscriber.
 
-When creating an observable you should determine how you want that observable to be used and whether or not you want to multicast its values. 
+When creating an observable you should determine how you want that observable to be used and whether or not you want to multicast its values.
 
 Let’s look at an example that counts from 1 to 3, with a one-second delay after each number emitted.
 
@@ -103,7 +103,7 @@ Notice that if you subscribe twice, there will be two separate streams, each emi
 
 ## Error handling
 
-Because observables produce values asynchronously, try/catch will not effectively catch errors. Instead, you handle errors by specifying an `error` callback on the observer. Producing an error also causes the observable to clean up subscriptions and stop producing values. An observable can  either produce values (calling the `next` callback), or it can complete, calling either the `complete` or `error` callback.
+Because observables produce values asynchronously, try/catch will not effectively catch errors. Instead, you handle errors by specifying an `error` callback on the observer. Producing an error also causes the observable to clean up subscriptions and stop producing values. An observable can either produce values (calling the `next` callback), or it can complete, calling either the `complete` or `error` callback.
 
 <code-example>
 myObservable.subscribe({