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C# documentation comments use XML elements to define the structure of the output documentation. For more details see the following reference :
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/xmldoc/recommended-tags
To generate a minimum content (just to avoid build warnings) type 3x "slash" followed by <Enter> key but this is not really enough for serious documentation (here only the <summary> tag, <returns> tag and method parameters are generated)