typo/clearer doc

doc/library/config.txt

@@ -693,7 +693,7 @@ import theano and print the config variable, as in:
 
     If ``'False'``, do not use cuDNN or check if it is available.
 
-    If ``'no_check'``, assume present and the version between heasers and linked match (so less compilation at context init)",
+    If ``'no_check'``, assume present and the version between header and library match (so less compilation at context init)",
 
 .. attribute:: config.conv.assert_shape