Latex: ignore spelling of commands, environments & citations

[ObserverOfTime]

Here, the only word that should be marked is exampl:

\begin{titlingpage}
\textbf{This is an exampl:} \cite{somecitation}
\end{titlingpage}

[ignamartinoli]

One thing to add:
spellsitter.nvim should also ignore text inside the \texttt tag, since it produces mono-spaced text, making it suitable for inline code.