Changed order of step-by-step explanation so it follows source code

Put RadiusOutlierRemoval before ConditionalRemoval so "the explanation" would follow the order of the source code. Corrected minor typos (it's->its, CondtionalRemoval->ConditionalRemoval), corrected "literalincludes" so the source included comprises complete code blocks.
Merge pull request #135 from georgebrindeiro/patch-3

Changed order of step-by-step explanation so it follows source code