Update sport docs (#2716)

* Rename doc file to match implementation file

* Use the right class name in sports doc

* Rename test file to match implementation

Author: clementf

doc/sports/sport.md

@@ -0,0 +1,41 @@
+# Faker::Sport
+
+## Conventional (Olympic including Paralympic) Sports
+
+```ruby
+# Any one of the below four categories:
+Faker::Sport.sport #=> "Snowboard"
+
+Faker::Sport.summer_olympics_sport #=> "Triathlon"
+
+Faker::Sport.winter_olympics_sport #=> "Luge"
+
+Faker::Sport.summer_paralympics_sport #=> "Goalball"
+
+Faker::Sport.winter_paralympics_sport #=> "Wheelchair curling"
+```
+
+## Ancient Sports
+
+```ruby
+Faker::Sport.ancient_olympics_sport #=> "Chariot racing"
+
+# Any modern or ancient olympic sport:
+Faker::Sport.sport(include_ancient: true) #=> "Rugby"
+```
+
+## Unusual Sports (just for fun)
+
+```ruby
+Faker::Sport.unusual_sport #=> "Camel wrestling"
+
+# Any modern olympic or unusual sport:
+Faker::Sport.sport(include_unusual: true) #=> "Gurning"
+```
+
+## Full list
+
+```ruby
+# Modern, ancient or unusual:
+Faker::Sport.sport(include_ancient: true, include_unusual: true) #=> "Powerlifting"
+```

doc/sports/sports.md

@@ -2,7 +2,7 @@
 
 require_relative '../../test_helper'
 
-class TestFakerSports < Test::Unit::TestCase
+class TestFakerSport < Test::Unit::TestCase
   def setup
     @tester = Faker::Sport
   end