Clarified use

[pauljurczak]

using Images is necessary for examples on the following pages to work, but it's not shown explicitly here or on the next page. See also https://discourse.julialang.org/t/efficient-way-to-find-which-package-defines-an-unknown-type/42222

[johnnychen94]

Thanks, this was written such way that using Images is not needed to load an image. But since you feel this confusing, I'm happy to get this in.

Images is a big umbrella package that loading it requires a lot of time, so the demo codes are written in a way to tell users which is the smallest package that he can rely on.

Please feel free to submit any changes you want, we really value your experiences as new users, since we as developers might overlook these details that confuse people. 😄

[pauljurczak]

Thanks. I realize that it wasn't necessary for the first page, but it may be helpful for readers going page by page, copying and executing code snippets from the manual. Just an extra safety margin for newbies.

[timholy]

Thanks Paul!