Fix description of (>+) and (<+) "arguments" -> "elements" and order …

…of $a,$b

lib/Language/setbagmix.pod

@@ -221,8 +221,8 @@ Equivalent to C«!(>)».
     multi sub infix:<<(<+)>>(Baggy $a, Baggy $b --> Bool)
 
 Returns C<True> if C<$a> is a Baggy B<subset> of C<$b>, i.e., if all the
-elements of C<$a> are in C<$b> and each argument of C<$a> is weighed at
-least as heavily as the element is in C<$b>.
+elements of C<$a> are in C<$b> and each element of C<$b> is weighed at
+least as heavily as the element is in C<$a>.
 
 =head4 infix ≼
 
@@ -236,8 +236,8 @@ Equivalent to L«(<+)».
     multi sub infix:<<(>+)>>(Any $a, Any $b --> Bool)
 
 Returns C<True> if C<$a> is a Baggy B<superset> of C<$b>, i.e., if all the
-elements of C<$b> are in C<$a> and no argument of C<$a> is weighted heavier
-than that element is in C<$b>.
+elements of C<$b> are in C<$a> and no element of C<$b> is weighted heavier
+than that element is in C<$a>.
 
 =head4 infix ≽