Documentation of short-hand command versions?

Hi!

I was planning on doing a PR, but got uncertain as to where to put thing. I would love for there to be some documentation for short-hand versions of different commands and attributes, such as `pri|prior|priori|priorit|priority`, `cont|conte|contex|context` and `pro|proj|proje|projec|project`. It is so nice to have shorter versions of things I use a lot, but I would love for there to be a place similar to the [All Commands](https://taskwarrior.org/docs/commands/) which showed all the different attributes and their short-hand versions as well.

I'm sorry if this is already documented somewhere, but I wasn't able to find it.

Keep up the great work, I really love taskwarrior!

Start with the existing All Commands page linked in the issue and review how commands and attributes are currently documented. Add a clear place showing the shorthand forms for examples such as priority, context, and project; the work is done when readers can find those abbreviations alongside the existing command documentation.

Written by the indexing model from the issue text.