PCBNEW-DRC: Let's extend DRC examples. TOGETHER!

Description

Let us collect some great DRC examples and document them well here. When we have our examples ready, they can be added by a dev. I go first and add them individually below as comments.

Steps to reproduce

1. Open DRC-Text Window
2. Click on Examples
3. Observe our collected examples.

KiCad Version

Not relevant, just added for compliance.

Application: Pcbnew

Version: (5.99.0-7910-gdc28de16d4), release build

Libraries:
	wxWidgets 3.0.5

Platform: Windows 10 (build 10586), 64-bit edition, 64 bit, Little endian, wxMSW

	wxWidgets: 3.0.5 (wchar_t,wx containers,compatible with 2.8)
	Boost: 1.73.0
	OCE: 6.9.1
	Curl: 7.71.0
	ngspice: 32
	Compiler: GCC 10.2.0 with C++ ABI 1014

Build settings:
	KICAD_SCRIPTING=ON
	KICAD_SCRIPTING_MODULES=ON
	KICAD_SCRIPTING_PYTHON3=OFF
	KICAD_SCRIPTING_WXPYTHON=ON
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
	KICAD_SCRIPTING_ACTION_MENU=ON
	KICAD_USE_OCE=ON
	KICAD_SPICE=ON