making the examples in the code consistent with rst docs

lib/resources/gem.rb

@@ -9,6 +9,7 @@ module Inspec::Resources
     example "
       describe gem('rubocop') do
         it { should be_installed }
+        its('version') { should eq '0.33.0' }
       end
     "
 

lib/resources/oneget.rb

@@ -16,6 +16,7 @@ module Inspec::Resources
     example "
       describe oneget('zoomit') do
         it { should be_installed }
+        its('version') { should eq '1.2.3' }
       end
     "
 

lib/resources/os.rb

@@ -7,7 +7,7 @@ module Inspec::Resources
     name 'os'
     desc 'Use the os InSpec audit resource to test the platform on which the system is running.'
     example "
-      describe os.family do
+      describe os[:family] do
         it { should eq 'redhat' }
       end