Add parameter info (dotnet#5183)

Author: gewarren

xml/System.ComponentModel/LocalizableAttribute.xml

@@ -39,7 +39,7 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>Specifies whether a property should be localized. This class cannot be inherited.</summary>
+    <summary>Specifies whether a property or parameter should be localized. This class cannot be inherited.</summary>
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
@@ -49,14 +49,19 @@
  By default, members that have no localizable attribute or are marked with the <xref:System.ComponentModel.LocalizableAttribute> set to `false` will have their property values persisted to code, if the data type allows. Otherwise, if the main component is set to `Localizable`, all properties will be persisted to the resource file. The default is `false`.  
   
 > [!NOTE]
->  When you mark a property with the <xref:System.ComponentModel.LocalizableAttribute> set to `true`, the value of this attribute is set to the constant member <xref:System.ComponentModel.LocalizableAttribute.Yes>. For a property marked with the <xref:System.ComponentModel.LocalizableAttribute> set to `false`, the value is <xref:System.ComponentModel.LocalizableAttribute.No>. Therefore, when you want to check the value of this attribute in your code, you must specify the attribute as <xref:System.ComponentModel.LocalizableAttribute.Yes?displayProperty=nameWithType> or <xref:System.ComponentModel.LocalizableAttribute.No?displayProperty=nameWithType>.  
+> When you mark a property with the <xref:System.ComponentModel.LocalizableAttribute> set to `true`, the value of this attribute is set to the constant member <xref:System.ComponentModel.LocalizableAttribute.Yes>. For a property marked with the <xref:System.ComponentModel.LocalizableAttribute> set to `false`, the value is <xref:System.ComponentModel.LocalizableAttribute.No>. Therefore, when you want to check the value of this attribute in your code, you must specify the attribute as <xref:System.ComponentModel.LocalizableAttribute.Yes?displayProperty=nameWithType> or <xref:System.ComponentModel.LocalizableAttribute.No?displayProperty=nameWithType>.  
   
- For more information, see [Attributes](/dotnet/standard/attributes/).  
-  
-   
-  
-## Examples  
- The following example marks a property as needing to be localized.  
+ For more information, see [Attributes](/dotnet/standard/attributes/).
+
+## Examples
+
+The following example marks the `message` parameter as needing to be localized.
+
+```csharp
+public static void ShowMessage([Localizable(true)] string message)
+```
+
+The following example marks a property as needing to be localized.  
   
  [!code-cpp[classic localizableattribute example#1](~/samples/snippets/cpp/VS_Snippets_Winforms/Classic LocalizableAttribute Example/CPP/source.cpp#1)]
  [!code-csharp[classic localizableattribute example#1](~/samples/snippets/csharp/VS_Snippets_Winforms/Classic LocalizableAttribute Example/CS/source.cs#1)]