documentation: example with thmbox={<kv-list>}

[mbertucci47]

Since theorems declared with the thmbox key do not respect most (all?) options from a style declared with \declaretheoremstyle, it would be useful to have an example in the documentation that uses the fact that the value of thmbox= can be a list of thmbox keys, similar to what is already done for shadethm. For example, something like

\declaretheorem[thmbox={L,bodystyle=\normalfont\noindent,leftmargin=1cm}]{boxtheorem}

There is the issue of needing four # in the parameters of headstyle and titlestyle mentioned in #25, but this could also be documented or an alternative approach given using \thmboxoptions:

\declaretheorem[thmbox={L,bodystyle=\normalfont\noindent,leftmargin=1cm}]{boxtheorem}
\thmboxoptions{headstyle={\textsc{#1 #2}}}

Note that \thmboxoptions must be used after since thmbox is not loaded prior to using the thmbox key.

It could be argued that users should just move to using mdframed or tcolorbox for fancy theorems, but I think thmbox gives a nice lightweight alternative that doesn't need to be abandoned quite yet.

[muzimuzhi]

It could be argued that users should just move to using mdframed or tcolorbox for fancy theorems, but I think thmbox gives a nice lightweight alternative that doesn't need to be abandoned quite yet.

+1 You've said the best I can argue :D

Will add an example following your suggesttion, and maybe partially solve #25 as well.