Add color to form reset snippet (#15064)

While testing the latest alpha release across Tailwind v3 projects, we
noticed one regression in relation to the default color of `<button>`
elements. In v3, the reset would change the default to `inherit` but in
v4 we would _not include it in the reset snippet inserted by the upgrade
too_.

This PR changes the upgrade snippet to include it:

```diff
 /*
   In Tailwind CSS v4, basic styles are applied to form elements by default. To
   maintain compatibility with v3, the following resets have been added:
 */
 @layer base {
   input,
   textarea,
   select,
   button {
     border: 0px solid;
     border-radius: 0;
     padding: 0;
+    color: inherit;
     background-color: transparent;
   }
 }
```

This PR also ensures that there's a newline between the two code
snippets.

## Test Plan

### Before


![image](https://github.com/user-attachments/assets/00b5ea23-a6f2-4f7c-93c9-62aac841ce97)

### After

<img width="1354" alt="Screenshot 2024-11-21 at 15 42 58"
src="https://github.com/user-attachments/assets/9a4503fe-683f-4d08-abf2-7dd111ed5428">

Author: philipp-spiess

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- Nothing yet!
+### Fixed
+
+- _Upgrade (experimental)_: Include `color` in the form reset snippet ([#](https://github.com/tailwindlabs/tailwindcss/pull/))
 
 ## [4.0.0-alpha.36] - 2024-11-21