Small fix to doc about shared containers with non implicit input, updated related test accordingly

doc/topics/function.txt

@@ -168,9 +168,9 @@ This is illustrated in the following example.
 >>> dec(1, 0)   # Try to manually set an implicit input
 <type 'exceptions.TypeError'>: Tried to provide value for implicit input: s
 >>> dec = function([x, In(s, update=(s-x), value=inc.container[s], implicit=False)], [])
->>> print dec[s] # dec has its own container for s, not yet filled
-None
 >>> inc[s] = 2
+>>> print dec[s]    # Containers are shared
+2.0
 >>> dec(1)
 []
 >>> print inc[s]    # Calling dec decreased the value in inc's container
@@ -179,7 +179,7 @@ None
 []
 >>> print inc[s]
 -1.0
->>> print dec[s]    # Still shared.
+>>> print dec[s]    # Still shared
 -1.0
 
 Input Argument Restrictions

theano/compile/tests/test_function.py

@@ -267,6 +267,7 @@ class T_function(unittest.TestCase):
             implicit = False)], [])
         self.failUnless(dec[s] is inc[s])
         inc[s] = 2
+        self.failUnless(dec[s] == 2)
         dec(1)
         self.failUnless(inc[s] == 1)
         dec(1, 0)