Updated SC2116 (markdown)

SC2116.md

@@ -25,7 +25,7 @@ You can just replace `$(echo myvalue)` with `myvalue`.
 ### Exceptions
 
 Sometimes this pattern is used because of side effect of `echo` or expansions. For example, here `$(echo ..)` is used to expand a glob.
-```
+```sh
 glob="*.png"
 files="$(echo $var)"
 ```
@@ -39,7 +39,7 @@ The `echo` is not useless, but this code is problematic because it concatenates
 All three methods will let you avoid issues with special characters in filenames.
 
 As another example, here `$(echo ..)` is used to expand escape sequences:
-```
+```sh
 unexpanded='var\tvalue'
 expanded="$(echo "$var")"
 ```