Possible Errata: Dependency Injection with Dagger 2

# Overview

I have noticed possible errors in the article linked [here](https://github.com/codepath/android_guides/wiki/Dependency-Injection-with-Dagger-2). The section in question is [Subcomponents](https://github.com/codepath/android_guides/wiki/Dependency-Injection-with-Dagger-2#subcomponents). The essence of the error is that I have used the code given in the examples, but they do not build successfully. I managed to get it to build after making some changes. However, I am not sure if the errors in question are introduced by something *I did* or inherently due to the code, considering I don't fully understand Dagger 2 yet.

# Setup

+ I coded the example directly following the previous example using `NetComponent`, `MyApp` etc.
+ `NetComponent` acts as the parent component.
+ `MyActivityScope` is defined using the default manner given in the Scopes section.

## Specifications

+ Android Studio 2.3
+ Dagger v2.10

# Error Message

The error message I am experiencing is: `android.widget.ArrayAdapter cannot be provided without an @Provides- or @Produces-annotated method`, along with other related stacktraces and locally-referencing information.

# Fixes

+ Add `@Named("my_list")` before the `@Inject ArrayAdapter arrayAdapter;` line in `MyActivity`.
+ Add a `void inject(MyActivity m)` method in the subcomponent.

It would be really great if someone could crosscheck and verify.