Add code example for CA2219 rule (#49062)

docs/fundamentals/code-analysis/quality-rules/ca2219.md

@@ -10,6 +10,8 @@ helpviewer_keywords:
 - CA2219
 author: gewarren
 ms.author: gewarren
+dev_langs:
+- CSharp
 ---
 # CA2219: Do not raise exceptions in exception clauses
 
@@ -37,6 +39,20 @@ When an exception is raised in a filter clause, the runtime silently catches the
 
 To fix this violation of this rule, do not explicitly raise an exception from a `finally`, filter, or fault clause.
 
+## Example
+
+```csharp
+try
+{
+    // ...
+}
+finally
+{
+    // This code violates the rule.
+    throw new Exception();
+}
+```
+
 ## When to suppress warnings
 
 Do not suppress a warning for this rule. There are no scenarios under which an exception raised in an exception clause provides a benefit to the executing code.