* [DOCS] Add examples of using named outputs in extensions (#17622) * [DOCS]Add examples of using named outputs in extensions * Fix opset * Apply suggestions from code review Co-authored-by: Tatiana Savina <tatiana.savina@intel.com> * Update docs/Extensibility_UG/frontend_extensions.md * Add reference to external docs * Update docs/Extensibility_UG/frontend_extensions.md Co-authored-by: Tatiana Savina <tatiana.savina@intel.com> --------- Co-authored-by: Tatiana Savina <tatiana.savina@intel.com> * Update docs/Extensibility_UG/frontend_extensions.md --------- Co-authored-by: Maxim Vafin <maxim.vafin@intel.com> Co-authored-by: Karol Blaszczak <karol.blaszczak@intel.com>