It's true that when Marx talks about abolishing private property, he has in mind means of production, but I think it's a mistake to try and explain that by making a distinction between "private" and "personal" property (a distinction which Marx himself didn't make, FWIW). The distinction ends up being a distraction, because its hard to make clearly (for reasons people in this thread have given), and, in any case, it's not really important to what Marx is saying; if you abolish ownership of the means of production (private property) there's no real point in ownership of consumption goods either (personal property). In a society in which I can only gain access to consumption goods by subordinating myself to the people who own the means of production, it matters that I have a firm hold on the consumption goods I need. But, if we were able to abolish private ownership of the means of production, I would be able to access consumption goods in some non-alienated way, so there would be no need to own them.
So I don't think it's quite right to say that "Marx and marxists do not believe that personal property should be abolished"; although the important thing is to abolish private property, the natural result of that would also be that personal property as we understand it would cease to exist.
What is Markdown, though, if not "a format which makes a computer program happy"? Presumably, your wife was already familiar with standard typographical conventions like italics for emphasis and indents to start paragraphs. A good text processing system for a computer should let the user deal with these conventions, rather than having to learn a markup system. I'd be interested to hear why you and your wife decided to use Markdown, and what alternatives you considered and rejected.
I don't loathe it, but I don't like it, and I'm sad that WYSIWYG text-editing software is still so bad that a kludge like Markdown seems like a good idea to people. Markdown isn't optimized for people (it's harder to read than properly typeset text, and when writing it you pretty quickly have to remember syntax details, like what sort of brackets to use for links), and it's not optimized for computers, either (it's harder to parse than, say, XML).
So I don't think it's quite right to say that "Marx and marxists do not believe that personal property should be abolished"; although the important thing is to abolish private property, the natural result of that would also be that personal property as we understand it would cease to exist.