Overfull \hbox (3.55196pt too wide) in paragraph at lines 34--36?

\usepackage{mathtools}

\newfontfamily\cyrillicfont[Mapping=tex-text]{Times New Roman}

\def\rightimage#1#2{\rightimagetupled{#1}{#2}{\TheValue{#2}}}
\def\rightimagetupled#1#2#3{\rightimagedescribed{#1}{#2}<\IfSubStr{#3}{,}{#3}{png,empty}>}
\NewDocumentCommand{\rightimagedescribed}{mmr<,u>}{
...
}

\begin{tikzpicture}
\begin{axis} [
    axis on top,
      xlabel={$x$}, ylabel={$y$}, zlabel={$z$}
      ]
\addplot coordinates {
    (1, 0, 0) (0, 1, 0) (0, 0, 3)
};
\end{axis}
\end{tikzpicture}