Update good-practice.md

Author: CarkHT

docs/teacher/guides/good-practice.md

@@ -72,32 +72,30 @@ 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.  
+        
+        \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)
+        
+        \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