Update DotNet_Security_Cheat_Sheet.md

[fcerullo-cycubix]

addition to A08 based on Microsoft documentation

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[jmanico]

Nice edit thank you! I am seeing some lint errors, can you kindly fix this?

cheatsheets/DotNet_Security_Cheat_Sheet.md:799 MD032/blanks-around-lists Lists should be surrounded by blank lines [Context: "- XmlSerializer and DataContra..."]

[szh]

Looks good! Just added a missing . for .NET and a link to the MS docs

Accepted your commits!

[jmanico]

I still see one lint error:

cheatsheets/DotNet_Security_Cheat_Sheet.md:799 MD032/blanks-around-lists Lists should be surrounded by blank lines [Context: "- XmlSerializer and DataContra..."]

[jmanico]

Lint fixes and @szh 's commits all integrated and merged!