Update good-practice.md

Author: CarkHT

docs/teacher/guides/good-practice.md

@@ -72,41 +72,42 @@ Live preview instantly renders a student's input. This is very useful for long/c
 
 ## Latex help
 
-1. Use `\begin{array}` to generate a compact table i.e. 
-  
-  ```
-  \begin{array}{|c|c|}
-  \hline
-  \theta_{2,0} & \theta_{1,L}\\
-  \hline
-  -6700 & 130.5641\\
-  \hline
-  -6600 & 161.6086\\
-  \hline
-  \end{array}
-  ```
-  
-  ![Image showing a example of a table](images/table.png)
-  
+1. Use `\begin{array}` to generate a compact table i.e.  
+    
+    ```latex
+    \begin{array}{|c|c|}
+    \hline
+    \theta_{2,0} & \theta_{1,L}\\
+    \hline
+    -6700 & 130.5641\\
+    \hline
+    -6600 & 161.6086\\
+    \hline
+    \end{array}
+    ```
+
+    ![Image showing a example of a table](images/table.png)
+
 2. Use `\begin{aligned}` to keep your working formatted nicely
-```
-\begin{aligned}
-M_{d e f} &=\dfrac{1}{2}(M+M^T)\\
-& =\dfrac{1}{2} \begin{pmatrix} 4 & 14\\ -6 & -11 \end{pmatrix}+\begin{pmatrix} 4 & -6\\ 14 & -11 \end{pmatrix}\\
-& =\begin{pmatrix} 4 & 4\\ 4 & -11 \end{pmatrix}
-\end{aligned}
-```
 
-![Image showing a example of a algined working](images/aligned.png)
+    ```latex
+    \begin{aligned}
+    M_{d e f} &=\dfrac{1}{2}(M+M^T)\\
+    & =\dfrac{1}{2} \begin{pmatrix} 4 & 14\\ -6 & -11 \end{pmatrix}+\begin{pmatrix} 4 & -6\\ 14 & -11 \end{pmatrix}\\
+    & =\begin{pmatrix} 4 & 4\\ 4 & -11 \end{pmatrix}
+    \end{aligned}
+    ```
+
+    ![Image showing a example of a algined working](images/aligned.png)
 
 3. Use `\left` and `\right` for equations with multiple brackets
 
-```
-f(x)=\left (\frac{(\cos (x) -x) + i(\sin (x) - x)}{wi} \right)
-```
+    ```latex
+    f(x)=\left (\frac{(\cos (x) -x) + i(\sin (x) - x)}{wi} \right)
+    ```
 
-![Image showing a example of a brackets](images/bracket.png)
+    ![Image showing a example of a brackets](images/bracket.png)
 
-This also works for `[ ]` and `\{ \}`
+    This also works for `[ ]` and `\{ \}`
 
 4. Use `\sin`, `\cos`, etc. as a shortcut for `\text{sin }`, `\text{cos }`, etc.