Fixed some typos / lines too long in doc

doc/library/config.txt

@@ -169,19 +169,20 @@ Config Attributes
     had affected your past experiments, as you only need to run your
     experiment again with the new version, and you do not have to
     understand the Theano internal that triggered the bug. A better
-    way to detect that see this will be implemented. See this `ticket
+    way to detect this will be implemented. See this `ticket
     <http://trac-hg.assembla.com/theano/ticket/514>`__.
 
-    This flag allows a new user not to get warnings about old bugs, that were fixed
-    before their first checkout of Theano.
+    This flag allows new users not to get warnings about old bugs, that were
+    fixed before their first checkout of Theano.
     You can set its value to the first version of Theano
     that you used (probably 0.3 or higher)
 
     `None` mean that all warnings will be displayed.
     `all` mean to hide all warnings.
 
-    It is recommended that you put a version, so that you will see future warning.
-    It is also recommended you put this into the .theanorc, so this setting
+    It is recommended that you put a version, so that you will see future
+    warnings.
+    It is also recommended you put this into your .theanorc, so this setting
     will always be used.
 
 .. attribute:: home