Matrix with three rows shows a vertical scrollbar

[jaakkor2]

Input like this shows a vertical scrollbar. Documenter v0.26.3.

```math
A = \begin{bmatrix}
a & b\\
c & d
\end{bmatrix}
``` .
```math
B = \begin{bmatrix}
a & b & c\\
d & e & f\\
g & h & i
\end{bmatrix}
``` .

[LazyScholar]

Add there

Documenter.jl/assets/html/scss/documenter/layout/_main.scss

Lines 12 to 14 in c942201

	.math-container {
	overflow-x: auto;
	}

overflow-y: hidden;

or
add here

Documenter.jl/assets/html/scss/documenter/_patches.scss

Lines 70 to 72 in c942201

	.katex-display, mjx-container, .MathJax_Display {
	margin: 0.5em 0 !important;
	}

padding: 0.5em 0 !important;

this will increase the overall y size of the page (more y space between formulas).

I prefer the first solution as it does not change the overall y-spacing although i could not test it for other use cases.