display them all -> allow number

[kberry]

texdoc -l bibtex says 142 results. Display them all? (y/N). That's fine, but when I previously saw the whole list, I often already know which number I want. Thus it would be nice to allow typing a number to that question, not just y/n. Just a suggestion.

[muzimuzhi]

Seems it's controlled by goodness of each item in the list and config max_lines (default 20). https://github.com/TeX-Live/texdoc/blob/f2fb792397a375a2f287fc0ef6e49c11e7a5702e/script/texdoclib-view.tlu#L164-L179

Similarly, once I wanted sth like texdoc --number 2 bibtex which will directly open the second result of texdoc -l bibtex.

[wtsnjp]

For your information, we have another related plan #97.