Fix typo in doc.

theano/configdefaults.py

@@ -535,7 +535,7 @@ del param
 
 if not config.cxx:
     warnings.warn("DeprecationWarning: there is no c++ compiler."
-                  "This is deprecated and Theano 0.11 a c++ compiler will be mandatory")
+                  "This is deprecated and with Theano 0.11 a c++ compiler will be mandatory")
 
 if rc == 0 and config.cxx != "":
     # Keep the default linker the same as the one for the mode FAST_RUN