Some fixes to pass tests

doc/Language/math.pod6

@@ -255,8 +255,8 @@ equations.
 
 For this example we are going to use
 L<C<Math::Model>|https://github.com/moritz/Math-Model> because its
- useful sintaxis, but remember that this module requires
- L<C<Math::RungeKutta>|https://github.com/moritz/Math-RungeKutta> as well.
+useful sintaxis, but remember that this module requires
+L<C<Math::RungeKutta>|https://github.com/moritz/Math-RungeKutta> as well.
  Simply install them with I<zef> before using these examples.
 In the future it should be a nice idea to add other modules.
 
@@ -455,7 +455,7 @@ my $m = Math::Model.new(
         velocity_x           => { $:growth_constant * $:x *($:x/$:a -1)*(1- $:x/$:k) },
         growth_constant    => { 0.7 },   # basal growth rate
         k                  => { 100 }, # carrying capacity
-        a		   => { 15 },  # critical point
+        a                  => { 15 },  # critical point
     },
     initials    => {
         x       => 15,