Suggest using the aligned environment (#1275)

for a system of equations.

docs/src/man/latex.md

@@ -71,6 +71,22 @@ Here's an equation:
 ```
 
 This is the binomial coefficient.
+
+---
+
+To write a system of equations, use the `aligned` environment:
+
+```math
+\begin{aligned}
+\nabla\cdot\mathbf{E}  &= 4 \pi \rho \\
+\nabla\cdot\mathbf{B}  &= 0 \\
+\nabla\times\mathbf{E} &= - \frac{1}{c} \frac{\partial\mathbf{B}}{\partial t} \\
+\nabla\times\mathbf{B} &= - \frac{1}{c} \left(4 \pi \mathbf{J} + \frac{\partial\mathbf{E}}{\partial t} \right)
+\end{aligned}
+```
+
+These are Maxwell's equations.
+
 ````
 
 which will be displayed as
@@ -84,3 +100,18 @@ Here's an equation:
 ```
 
 This is the binomial coefficient.
+
+---
+
+To write a system of equations, use the `aligned` environment:
+
+```math
+\begin{aligned}
+\nabla\cdot\mathbf{E}  &= 4 \pi \rho \\
+\nabla\cdot\mathbf{B}  &= 0 \\
+\nabla\times\mathbf{E} &= - \frac{1}{c} \frac{\partial\mathbf{B}}{\partial t} \\
+\nabla\times\mathbf{B} &= - \frac{1}{c} \left(4 \pi \mathbf{J} + \frac{\partial\mathbf{E}}{\partial t} \right)
+\end{aligned}
+```
+
+These are Maxwell's equations.