Update sql-server-deadlocks-guide.md

[OleksiiKovalov]

adding information about how to handle deadlock error using try/catch block (see https://learn.microsoft.com/en-us/previous-versions/sql/sql-server-2005/ms179296(v=sql.90)?redirectedfrom=MSDN#working-with-trycatch)

@microsoft-github-policy-service agree