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

PR Close #33422

aio/content/guide/dependency-injection-in-action.md

@@ -586,7 +586,7 @@ an interface is not a valid DI token because it is a TypeScript artifact that do
 Use this abstract class interface to get the strong typing of an interface,
 and also use it as a provider token in the way you would a normal class.
 
-A  class interface should define *only* the members that its consumers are allowed to call.
+A class interface should define *only* the members that its consumers are allowed to call.
 Such a narrowing interface helps decouple the concrete class from its consumers.