Updated SC2154 (markdown)

SC2154.md

@@ -11,6 +11,10 @@ or
     target="world"
     echo "hello $tagret"  # misspelled
 
+or
+
+    echo "Result: ${mycmd -a myfile}"  # trying to execute commands
+
 ### Correct code:
 
     var=name
@@ -22,6 +26,10 @@ or
     target="world"
     echo "hello $target"
 
+or
+
+    echo "Result: $(mycmd -a myfile)"
+
 ### Rationale:
 
 ShellCheck has noticed that you reference a variable that is not assigned. Double check that the variable is indeed assigned, and that the name is not misspelled.