[ruby/securerandom] [DOC] Satisfy RDoc coverage

https://github.com/ruby/securerandom/commit/ddf2672e47

lib/securerandom.rb

@@ -53,6 +53,8 @@ module SecureRandom
 
     private
 
+    # :stopdoc:
+
     # Implementation using OpenSSL
     def gen_random_openssl(n)
       return OpenSSL::Random.random_bytes(n)
@@ -84,6 +86,8 @@ module SecureRandom
       end
     end
 
+    # :startdoc:
+
     # Generate random data bytes for Random::Formatter
     public :gen_random
   end