Typo fixes

theano/configdefaults_late.py

 """
-This file define Theano flags, but we define them later in the import order.
+This file defines Theano flags which need to be defined late in import order.
 
-This is needed as we need to have parsed the previous
+This is needed as they rely on the values of other previously-defined flags.
 """
 
 import os
@@ -49,8 +49,8 @@ else:
 dummy_stdin = open(os.devnull)
 
 if default_openmp and theano.configdefaults.gxx_avail:
-    #check if g++ support openmp. We need to compile a file as the EPD
-    #version have openmp enabled in the specs file but do not include
+    #check if g++ supports openmp. We need to compile a file as the EPD
+    #version has openmp enabled in the specs file but does not include
     #the OpenMP files.
     try:
         code = """