Still a few mentionings of "RJ11"

[osirisinferi]

While the extension port documentation was (partly) updated from RJ11 to RJ12 in 7a78566, there's still mentioning of the incorrect RJ(-)11 connector in:

• Quick Start
• Extension Port
• Power Options

While the text is easily changed, in the Quick Start there's also an image of the back side which mentions "RJ11". And I couldn't find the correct font file using Identifont to change that one.