You're both right. Combine the two and you get what doxxing originally was:

"Dox" is short for "documents", and it originally referred to compiling a multi-page document of all known personal information, using disparate public sources: name, address, phone, email, employer, family members, family address/phone etc, etc, etc. It came from troll boards and was designed to make it easy to harass targets.

The term got significantly watered down when it got out to the broader internet.