Missing documentation about `examples` configuration

[ybiquitous]

Currently, the examples: field is supported in querly.yaml, but the documentation is missing.

querly/template.yml

Lines 18 to 26 in 55b2a6d

	examples:
	- before: |
	io = File.open("foo.txt")
	io.write("hello world")
	io.close
	after: |
	File.open("foo.txt") do |io|
	io.write("hello world")
	end

Current documentation in manual/configurarion.md: