Documentation update to discourage use of old extension

Author: scrhartley

www/content/extensions/_index.md

@@ -37,7 +37,7 @@ htmx extensions are split into two categories:
 | [debug](https://github.com/bigskysoftware/htmx-extensions/blob/main/src/debug/README.md)                                 | This extension includes log all htmx events for the element it is on, either through the `console.debug` function or through the `console.log` function with a `DEBUG:` prefix.                                                                                                               |
 | [disable-element](https://github.com/bigskysoftware/htmx-extensions/blob/main/src/disable-element/README.md)             | This extension disables an element during an htmx request, when configured on the element triggering the request. Note that this functionality is now part of the core of htmx via the `hx-disabled-elt` attribute                                                                            |
 | [event-header](https://github.com/bigskysoftware/htmx-extensions/blob/main/src/event-header/README.md)                   | This extension adds the `Triggering-Event` header to requests. The value of the header is a JSON serialized version of the event that triggered the request.                                                                                                                                  |
-| [include-vals](https://github.com/bigskysoftware/htmx-extensions/blob/main/src/include-vals/README.md)                   | The `include-vals` extension allows you to programmatically include values in a request with a `include-vals` attribute. The value of this attribute is one or more name/value pairs, which will be evaluated as the fields in a javascript object literal.                                   |
+| [include-vals](https://github.com/bigskysoftware/htmx-extensions/blob/main/src/include-vals/README.md)                   | The `include-vals` extension allows you to programmatically include values in a request with a `include-vals` attribute. Note that this functionality is now part of the core of htmx via the `hx-vals` attribute.                                                                            |
 | [json-enc](https://github.com/bigskysoftware/htmx-extensions/blob/main/src/json-enc/README.md)                           | This extension encodes parameters in JSON format instead of url format.                                                                                                                                                                                                                       |
 | [form-json](https://github.com/xehrad/form-json/blob/main/README.md)                                                     | Similar to `json-enc`, but with **type preservation**. Converts form data into structured JSON while maintaining correct types for numbers, booleans, and files (Base64-encoded). Supports nested structures using dot (`.`) or bracket (`[]`) notation.                                      |
 | [json-enc-custom](https://github.com/Emtyloc/json-enc-custom/blob/main/README.md)                                        | This extension works similarly to json-enc but allows for very complex structures, such as embedding JSON objects, lists, or handling indexes, just by using the name attribute.                                                                                                              |