Initial minor changes (grammatical in methods; require -> require_relative in tri...).

src/about_methods.rb

@@ -37,7 +37,7 @@ class AboutMethods < Neo::Koan
     #
   end
 
-  # NOTE: wrong number of argument is not a SYNTAX error, but a
+  # NOTE: wrong number of arguments is not a SYNTAX error, but a
   # runtime error.
   def test_calling_global_methods_with_wrong_number_of_arguments
     exception = assert_raise(___(ArgumentError)) do

src/about_triangle_project.rb

@@ -1,7 +1,7 @@
 require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 # You need to write the triangle method in the file 'triangle.rb'
-require 'triangle.rb'
+require_relative 'triangle.rb'
 
 class AboutTriangleProject < Neo::Koan
   def test_equilateral_triangles_have_equal_sides