Creates TIP explaining usage of HtmlAttributeName in custom Tag Helper (#26962)

* Adds note explaining HtmlAttributeName usage

* changes HtmlAttributeName hint to TIP

* Fixes TIP syntax

* removes link to HtmlAttributeName API docs

* Updates

* Update aspnetcore/mvc/views/tag-helpers/authoring.md

* restores f4949b6, moves down and removes TIP markup

Co-authored-by: Luke Latham <1622880+guardrex@users.noreply.github.com>
Co-authored-by: Rick Anderson <3605364+Rick-Anderson@users.noreply.github.com>

aspnetcore/mvc/views/tag-helpers/authoring.md

@@ -117,6 +117,21 @@ That approach works for the attribute "href" as long as it doesn't currently exi
 
    With a self-closing email tag helper, the output would be `<a href="mailto:Rick@contoso.com" />`. Self-closing anchor tags are not valid HTML, so you wouldn't want to create one, but you might want to create a tag helper that's self-closing. Tag helpers set the type of the `TagMode` property after reading a tag.
 
+  You can also map a different attribute name to a property using the [`[HtmlAttributeName]` attribute](xref:Microsoft.AspNetCore.Razor.TagHelpers.HtmlAttributeNameAttribute).
+  
+  To map an attribute named `recipient` to the `MailTo` property:
+  
+  ```csharp
+  [HtmlAttributeName("recipient")]
+  public string? MailTo { get; set; }
+  ```
+  
+  Tag Helper for the `recipient` attribute:
+  
+  ```html
+  <email recipient="…"/>
+  ```
+
 ### ProcessAsync
 
 In this section, we'll write an asynchronous email helper.