Fix typo and add float creation to specs

Author: paulgoetze

2_Numbers/1_The_different_types_of_numbers/solution.rb

@@ -1,5 +1,6 @@
 # e.g.:
-fixnum = 5
-bignum = 100_000_000_000_000_000_000
+fixnum   = 5
+bignum   = 100_000_000_000_000_000_000
+float    = 8.25
 rational = Rational(2, 7)
-complex = Complex(0.1, 2.5)
+complex  = Complex(0.1, 2.5)

2_Numbers/1_The_different_types_of_numbers/solution_spec.rb

@@ -4,10 +4,11 @@
   [['solution::code']]
 
   {
-    fixnum: Fixnum,
-    bignum: Bignum,
+    fixnum:   Fixnum,
+    bignum:   Bignum,
+    float:    Float,
     rational: Rational,
-    complex: Complex
+    complex:  Complex
   }.each do |variable, class_name|
     it "defines a variable with name \"#{variable}\"" do
       expect(local_variables.include?(variable)).to be true

2_Numbers/1_The_different_types_of_numbers/task.md

@@ -44,6 +44,7 @@ If you want to learn more, read about Fixnum and Bignum here:
 A *Float* represents an *inexact real number*.
 You can create a Float by declaring a number with a decimal place, like `3.0`
 or `-2_000.25`.
+
 Another way to create a Float is to call `Float()` with a parameter, e.g.:
 
 `  Float(3)`   *# => 3.0*
@@ -58,7 +59,7 @@ You can create a Rational by calling `Rational()` with one or two parameters, e.
 
 `  Rational(2)`     *# => (2/1)*
 `  Rational(2, 3)`  *# => (2/3)*
-`  Rarional('2/3')` *# => (2/3)*
+`  Rational('2/3')` *# => (2/3)*
 
 Read more about Rational here: (ruby-doc core: Rational).