* lisp/ox-latex.el (org-latex--org-table): The `:options' LaTeX
attribute allows adding an optional argument (`\begin{env}[opt]'),
since certain tabular environments, such as `longtblr', accept optional
arguments.
* doc/org-manual.org (Tables in LaTeX export): this feature in the manual.
* etc/ORG-NEWS (New :options attribute when exporting tables to
LaTeX): this feature in `ORG-NEWS'.