small touch ups and sentence rewrites on modules

lib/Language/modules.pod

@@ -16,8 +16,8 @@ L<roles|/language/objects#Roles>, L<grammars|Grammar>),
 L<subroutines|/language/functions>, and sometimes
 L<variables|/language/variables>. In Perl 6 I<module> can also refer
 to a type of package declared with the C<module> keyword (see example
-below) but here we mostly mean "module" as a set of useful source
-files in a well defined namespace.
+below) but here we mostly mean "module" as a set of source
+files in a namespace.
 
 =head2 Loading and Basic Importing
 
@@ -31,7 +31,7 @@ exported available in the current lexical scope.
     # loads and imports default symbols at compile time
     use MyModule;
 
-    # imports defualt symbols at compile time
+    # imports default symbols at compile time
     import MyModule;
 
     # loads module at runtime
@@ -88,9 +88,9 @@ tags: C<ALL>, C<DEFAULT> and C<MANDATORY>.
 
 =head2 EXPORT
 
-You can arbitrarily export symbols with an C<EXPORT> sub. C<EXPORT>
+You can export arbitrary symbols with an C<EXPORT> sub. C<EXPORT>
 must return a L<EnumMap>, where the keys are the symbol names and
-the values are the symbol values. The names should include the sigil
+the values are the desired values. The names should include the sigil
 (if any) for the associated type.
 
     =begin code
@@ -124,9 +124,10 @@ Note, C<EXPORT> can't be declared inside a package because
 presently rakudo (2015.06) seems to treat C<EXPORT> as part of the
 compunit rather than the package.
 
-C<EXPORT> gets passed positional arguments passed to C<use>. However
-if C<use> is passed an argument the module will no longer export
-default items.
+If you pass positional parameters to C<use> they will be passed to
+C<EXPORT>. The module no longer exports default symbols if a
+positional is passed, however you may still import them explicitly by
+passing :C<DEFAULT> to C<use>.
 
     =begin code
     # lib/MyModule