WiFi connection to the Pi, question on configuration

[Bosse_B]

I am following this HowTo in order to set up a new B+ for WiFi connection. I am going to use the adapter recommended in the HowTo.

But I have a question regarding editing the configuration file:

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sudo nano /etc/network/interfaces

In the HowTo is shown the initial content and then it describes how to modify it.
I am OK with the additions to the file including the SSID and passphrase, but what is not mentioned but still done is that the following lines are removed from the file in the HowTo:

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wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

Is this an omission in the HowTo so they should remain also after the edit or is it important that they are removed?
I have no clue as to the purpose of these lines so I cannot answer myself.
I don't know what a supplicant even is....

Any help appreciated!

[klricks]

I believe that those files are created when running the WIFI Config utility in the GUI (startx). (Raspbian OS)

Note that random howto's you find on internet may be out of date....