fix incorrect fluent string doesntContain example in documentation (#10904)

* Add resove to reserved keywords in blade

* fix incorrect fluent string doesntContain example in documentation"

Author: sediqzada94

strings.md

@@ -2342,7 +2342,7 @@ use Illuminate\Support\Str;
 
 $doesntContain = Str::of('This is my name')->doesntContain('MY', ignoreCase: true);
 
-// true
+// false
 ```
 
 <a name="method-fluent-str-doesnt-end-with"></a>