Updated SC2124 (markdown)

SC2124.md

@@ -59,12 +59,15 @@ The same is true for `${@: -1}`, which results in 0 or 1 elements: `var=${*: -1}
 None.
 
 ### Adding an element to an array may trigger this warning when you forget the parenthesis.
-```
+```sh
 filelist="${filelist[@]}" "$filename"
 ```
+
 What was meant is:
-```
+
+```sh
 filelist=("${filelist[@]}" "$filename")
 ```
+
 Note: This syntax is compatible with older shells;
-in later shells (bash 3.1+ and zsh 4.2+), you can do `filelist+=("$filename")`.
+in later shells (bash 3.1+ and zsh 4.2+), you can do `filelist+=("$filename")`.