fixed typo

Author: geoknee

_sessions/c3s4/8_hash_array_conversion.md

@@ -38,7 +38,7 @@ h = Hash[zipped]  #=> {1 => 'one', 2 => 'two', 3 => 'three'}
 
 h1 = Hash['a', 1, 'b', 2, 'c', 3]
 
-h2 = Hash[[['a',1],['b',2],['c',3]]
+h2 = Hash[['a',1],['b',2],['c',3]]
 
 
 # Converting to arrays (and back?)
@@ -57,4 +57,4 @@ values = h.values
 
 # How would you combine keys and values back into h?
 {% endhighlight %}
-{% endexercise %}
+{% endexercise %}