Fix a couple of typos

Author: jdufresne

lib/rack/test/cookie_jar.rb

@@ -45,7 +45,7 @@ def initialize(raw, uri = nil, default_host = DEFAULT_HOST)
         @options['path'] ||= uri.path.sub(/\/[^\/]*\Z/, '')
       end
 
-      # Wether the given cookie can replace the current cookie in the cookie jar.
+      # Whether the given cookie can replace the current cookie in the cookie jar.
       def replaces?(other)
         [name.downcase, domain, path] == [other.name.downcase, other.domain, other.path]
       end

spec/rack/test/cookie_spec.rb

@@ -234,7 +234,7 @@ def cookie.expired?; true end
     last_request.cookies.must_equal 'value' => '10', 'foo' => 'bar'
   end
 
-  it 'skips emtpy string cookies' do
+  it 'skips empty string cookies' do
     set_cookie "value=10\n\nfoo=bar"
     get '/cookies/show'
     last_request.cookies.must_equal 'value' => '10', 'foo' => 'bar'