[variables] fix length of a line

lib/variables.pod

@@ -39,10 +39,10 @@ Item assignment places the value from the right-hand side into the variable
 
 List assignment leaves the choice of what to do to the variable on the left.
 
-For example L<Array> variables (C<@> sigil) empty themselves on list assignment, and then
-put all the values from the right-hand side into themselves. Contrary to item
-assignment, it means that the type of the variable on the left always stays
-C<Array>, regardless of the type of the right-hand side.
+For example L<Array> variables (C<@> sigil) empty themselves on list assignment,
+and then put all the values from the right-hand side into themselves. Contrary
+to item assignment, it means that the type of the variable on the left always
+stays C<Array>, regardless of the type of the right-hand side.
 
 Note that the item assignment has tighter precedence than list assigment, and
 also tighter than the comma. See L<operators> for more details.