[REQUEST] Doc: improve/create documentation for default styles

[sbraz]

Have you checked the issues for a similar suggestions? → Yes

How would you improve Rich?

Hi, I would like the documentation to mention all values from rich/default_styles.py. I'll explain why below.

What problem does it solve for you?

While I was playing with progress bars, I found out that "[progress.percentage]{task.percentage:>3.0f}%" is the default format for rich.progress.TaskProgressColumn objects. However, I couldn't easily find where progress.percentage was defined. https://rich.readthedocs.io/en/stable/search.html?q=%22progress.percentage%22&check_keywords=yes&area=default didn't output anything useful.

It was only when I grepped the code that I found its definition here: https://github.com/Textualize/rich/blob/e1e6d745f670ff3df6b8f47377c0a4006cb74066/rich/default_styles.py#L132

Since the various default styles are used in the example code and the documentation, it would be nice to document them.

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[sbraz]

I just noticed that the doc mentions python -m rich.default_styles: https://github.com/Textualize/rich/blob/e1e6d745f670ff3df6b8f47377c0a4006cb74066/docs/source/style.rst#L147

However, adding the list below the command would still make it easier in my opinion.