Changing the codeblock in intorduction to match with approach content

Author: jagdish-15

exercises/practice/bob/.approaches/introduction.md

@@ -22,14 +22,18 @@ class Bob {
     String hey(String input) {
         var inputTrimmed = input.trim();
 
-        if (isSilent(inputTrimmed))
+        if (isSilent(inputTrimmed)) {
            return "Fine. Be that way!";
-        if (isShouting(inputTrimmed) && isQuestioning(inputTrimmed))
+        }
+        if (isShouting(inputTrimmed) && isQuestioning(inputTrimmed)) {
             return "Calm down, I know what I'm doing!";
-        if (isShouting(inputTrimmed))
+        }
+        if (isShouting(inputTrimmed)) {
             return "Whoa, chill out!";
-        if (isQuestioning(inputTrimmed))
+        }
+        if (isQuestioning(inputTrimmed)) {
             return "Sure.";
+        }
 
         return "Whatever.";
     }