Update testing.md

Author: cchiw

src/attributes/testing.md

@@ -97,13 +97,13 @@ fn ah(){ println!("Spit it out!!!!");}
 fn ah(){ println!("This is not your party. Run!!!!");}
 
 fn drink(beverage: &str){
-   if beverage == "lemonade"{ ah();}
-   else{println!("Some refreshing {} is all I need.", beverage);}
+    if beverage == "lemonade"{ ah();}
+    else{println!("Some refreshing {} is all I need.", beverage);}
 }
 
 fn main(){
-   drink("water");
-   drink("lemonade");
+    drink("water");
+    drink("lemonade");
 }
 ```
 
@@ -113,11 +113,11 @@ Here is the same example rewritten.
 
 fn drink(beverage: &str) {
    // You shouldn't drink too much sugary beverages.
-   if beverage == "lemonade" {
-     if cfg!(panic="abort"){ println!("This is not your party. Run!!!!");}
-     else{ println!("Spit it out!!!!");}
-   }
-   else{ println!("Some refreshing {} is all I need.", beverage); }
+    if beverage == "lemonade" {
+        if cfg!(panic="abort"){ println!("This is not your party. Run!!!!");}
+        else{ println!("Spit it out!!!!");}
+    }
+    else{ println!("Some refreshing {} is all I need.", beverage); }
 }
 
 fn main() {