docs: Remove Supermaven (#49317)

Closes #ISSUE

Before you mark this PR as ready for review, make sure that you have:
- [x ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ x] Done a self-review taking into account security and performance
aspects
- [x ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

docs/src/ai/edit-prediction.md

@@ -1,6 +1,6 @@
 ---
-title: AI Code Completion in Zed - Zeta, Copilot, Supermaven
-description: Set up AI code completions in Zed with Zeta (built-in), GitHub Copilot, Supermaven, or Codestral. Multi-line predictions on every keystroke.
+title: AI Code Completion in Zed - Zeta, Copilot, Sweep, Mercury Coder
+description: Set up AI code completions in Zed with Zeta (built-in), GitHub Copilot, Sweep, Codestral, or Mercury Coder. Multi-line predictions on every keystroke.
 ---
 
 # Edit Prediction
@@ -8,7 +8,7 @@ description: Set up AI code completions in Zed with Zeta (built-in), GitHub Copi
 Edit Prediction is how Zed's AI code completions work: an LLM predicts the code you want to write.
 Each keystroke sends a new request to the edit prediction provider, which returns individual or multi-line suggestions that can be quickly accepted by pressing `tab`.
 
-The default provider is [Zeta, a proprietary open source and open dataset model](https://huggingface.co/zed-industries/zeta), but you can also use [other providers](#other-providers) like GitHub Copilot, Supermaven, and Codestral.
+The default provider is [Zeta, a proprietary open source and open dataset model](https://huggingface.co/zed-industries/zeta), but you can also use [other providers](#other-providers) like GitHub Copilot, Sweep, Mercury Coder, and Codestral.
 
 ## Configuring Zeta