Suggestion: rewrite docstrings for usage rather than reference

[cormullion]

When I want to lookup what the syntax is for a function, I find the REPL experience less than ideal sometimes. For example, I wanted to know what the syntax for padded arrays and borders was:

(etc.)

Perhaps there's a little bit too much purple text for this text to be readable or helpful?

I think it would make sense to move these from the help to the manual.

[timholy]

Yes, or even # Extended help. See JuliaImages/ImageFiltering.jl#153. I've had that open and tagged as "good first issue" for years, but even though we get thousands of downloads a month people don't seem so interested in stepping forward to help close it.

[cormullion]

I'd be happy to move that LATEX out of the docstring into the manual, where I think it should go. I'll make a PR and see how it goes.

[ashwanirathee]

This issue is resolved right or do we face a similar issue elsewhere?

[timholy]

Seems largely satisfied to me! Thanks again @cormullion for your heroism.