refactor(service_container): refactoring on wording || part 2

Author: Guikingone

service_container/injection_types.rst

@@ -103,8 +103,8 @@ then extending it and overriding the constructor becomes problematic.
 Immutable-setter Injection
 --------------------------
 
-Another possible injection in to use a method which return a separate instance
-by cloning the original service, this approach allow you to make a service immutable::
+Another possible injection is to use a method which returns a separate instance
+by cloning the original service, this approach allows you to make a service immutable::
 
     // ...