You can use code snippets to insert any lines you want.
Also, if you type three single quotation marks (''') on the line above the function header, it will insert the XML header template that you can then fill out.
These XML comments can be interpreted by documentation software, and they are included in the build output as an assembly.xml file. If you keep that XML file with the DLL and reference that DLL in another project, those comments become available in intellisense.