Fix YARD warnings in Mdm::Workspace
Fix YARD warnings in Mdm::Workspace

[#50752269]

farias-r7/metasploit_data_models,bcook-r7/metasploit_data_models,rapid7/metasploit_data_models,farias-r7/metasploit_data_models,rapid7/metasploit_data_models,rapid7/metasploit-cache,farias-r7/metasploit_data_models,bcook-r7/metasploit_data_models,rapid7/metasploit-cache,rapid7/metasploit-cache,rapid7/metasploit-cache,rapid7/metasploit_data_models,bcook-r7/metasploit_data_models