prime.rb: remove alias after timeout test

* test/test_prime.rb: remove alias after timeout test.

* lib/prime.rb: fix typo.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/prime.rb

@@ -419,7 +419,7 @@ class Prime
     end
   end
 
-  # Internal use. An implementation of eratosthenes' sieve
+  # Internal use. An implementation of Eratosthenes' sieve
   class EratosthenesSieve
     include Singleton
 

test/test_prime.rb

@@ -189,6 +189,7 @@ class TestPrime < Test::Unit::TestCase
     ensure
       class << Integer
         alias_method :sqrt, :org_sqrt
+        remove_method :org_sqrt
       end
     end