Update SA1023 documentation for function pointers

Author: sharwell

documentation/SA1023.md

@@ -29,6 +29,11 @@ The spacing around the symbol depends upon whether the symbol is used within a t
 object* x = null;
 ```
 
+This applies to function pointer declarations as well. In `delegate* unmanaged[Cdecl]<int*, void>`, the `*` immediately
+following `delegate` is treated as part of the type declaration and follows the same spacing rules. When a calling
+convention is omitted, the `*` should be written directly before the parameter list, for example `delegate*<int*>` (no
+space before the `<`).
+
 When a dereference or access-of symbol is used outside of a type declaration, the opposite rule applies. In this case, the symbol should always be preceded by a single space, unless it is the first character on the line, or is preceded by an opening square bracket, a parenthesis or a symbol of the same type i.e. an equals. The symbol should not be followed by whitespace, and should not be the last character on the line. For example:
 
 ```csharp