fix: Add More Info on Equality Operators page

[custardcream98]

Issue

Resolves: #676

Summery

@debug 1 != 1px; is false, and @debug 1 != 1rem; is also false.

So I've added some and fixed comment.

[custardcream98]

I've found out that it wasn't a typo, so I've added some more for those who get confused like me. 😂😂

[custardcream98]

So,

@debug 1 != 1px;

is false on LibSass version under 3.6.5
and true on LibSass version 3.6.5 thanks to this change
(and also true on lateset Dart Sass)

[nex3]

Thanks for the contribution, but we've already got info about the change in equality behavior on that page, in our standardized component for describing cross-version/-implementation differences:

sass-site/source/documentation/operators/equality.html.md.erb

Lines 5 to 11 in 0277117

	<% impl_status dart: true, libsass: false, ruby: '4.0.0 (unreleased)', feature: "Unitless Equality" do %>
	LibSass and older versions of Ruby Sass consider numbers without units to be
	equal to the same numbers with any units. This behavior was deprecated and has
	been removed from more recently releases because it violates [transitivity][].
	[transitivity]: https://en.wikipedia.org/wiki/Transitive_relation
	<% end %>

[custardcream98]

Oh, I didn't notice that toggle button. Thanks! 👍