lowercase mono-complete package name

[faviocb]

Wrong casing of "Mono-Complete" package in GettingStartedDeb.md

In order to install mono in Debian Wheezy, we have to lowercase the package name

FROM
sudo apt-get install Mono-Complete
TO
sudo apt-get install mono-complete

Currently the script doesn't work

Expected result

mono-complete package installed successfully.

Actual result

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package Mono-Complete

Operating system

Debian Wheezy 7.7
(32 bits)

[dnfclas]

Hi @thekane, I'm your friendly neighborhood .NET Foundation Pull Request Bot (You can call me DNFBOT). Thanks for your contribution!
You've already signed the contribution license agreement. Thanks!
We will now validate the agreement and then real humans will evaluate your PR.

TTYL, DNFBOT;

[Eilon]

Thanks!