adding the poll question

lectures/08_vector_implementation/README.md

@@ -217,11 +217,11 @@ The destructor is called implicitly when an automatically-allocated object goes
 
 Match up the line of code with the function that is called. Each letter is used exactly once.
 
-| Foo f1;	     |		a) assignment operator	| 
-| Foo\* f2; 	     |		b) destructor  		|
-| f2 = new Foo(f1);  |		c) copy constructor  	|
-| f1 = \*f2;	     |		d) default constructor  |
-| delete f2;	     |		e) none of the above  	|
+| Foo f1;	     |		a) assignment operator  
+| Foo\* f2; 	     |		b) destructor  
+| f2 = new Foo(f1);  |		c) copy constructor  
+| f1 = \*f2;	     |		d) default constructor 
+| delete f2;	     |		e) none of the above  
 
 ## 8.15 Leetcode Exercises