it should be the plugin rule name, than eslint core rule name.

…always mode (#333)

interface-name-prefix currenlty provides 'Interface name must not be
prefixed with "I".' but when in always mode it should give an error
message that matches the intent, added 'Interface name must be prefixed
with "I".' for when "always" is enabled

fixes #336

…res regarding computed property names (#340)

Currently, the name of a method definition or a class property is always assumed to be a literal or an identifier. However, this fails to account for computed property names.
In those cases, we currently sometimes give the name for a method definition with a computed name as `undefined`, which as a result causes methods with differing computed property names to be marked as overloads of each other. In this PR, we slice the text of the computed property name out to handle these cases.

Fixes #343

Part of the [PR to enforce an alphabetic order for members](#2639) is to rewrite the existing docs to better document the current behavior of `member-ordering`. As this touches almost any line in the rule documentation, I thought it makes sense to open a separate PR for that.

In this PR, I've reworked the entire rule documentation to make it (hopefully) more clear how this rule works. The examples are mostly taken from the current rule documentation - some with little adaptations.
Besides that, I've changed a few names and added some comments in the rule implementation to make it more understandable (basically the points I didn't understand immediately while trying to understand the current implementation to better describe the rule).