Yes, typing in HTML is like pressing enter in word, but that doesn't make it a programming language, it makes it a markup language.

A markup language is also what you can use to format comments here: You use a specific syntax to indicate how you want things formatted.

The separation from a programming language is that a programming language can be used to implement logic, like saying: In the following paragraph, a word should be bold if it contains the letter "A". That cannot be done with a markup language.