Have a look in your /usr/share/doc folder. Run this: find /usr/share/doc -name '*.htm*' You'll be surprised. Your system's package manager is installing

Have a look in your /usr/share/doc folder. Run this: find /usr/share/doc -name '*.htm*' You'll be surprised. Your system's package manager is installing the HTML documentation right along with the software you install. When you update your system, new package versions along with their corresponding documentation are downlaoded.