[llvm] [docs] Add TOC for InstCombine contributor guide (PR #136293)

[via llvm-commits]

https://github.com/amordo created https://github.com/llvm/llvm-project/pull/136293

![image](https://github.com/user-attachments/assets/01c7593d-1d74-4f99-857b-0fb7ad409cbb)


>From 43360afa6df6c770d2805e905e7d2f56a43fa30d Mon Sep 17 00:00:00 2001
From: amordo <iammorjj at gmail.com>
Date: Fri, 18 Apr 2025 13:06:39 +0200
Subject: [PATCH] [docs] Add TOC for InstCombine contributor guide

---
 llvm/docs/InstCombineContributorGuide.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/llvm/docs/InstCombineContributorGuide.md b/llvm/docs/InstCombineContributorGuide.md
index ce5f958058c55..b4041f8a5b93f 100644
--- a/llvm/docs/InstCombineContributorGuide.md
+++ b/llvm/docs/InstCombineContributorGuide.md
@@ -1,5 +1,9 @@
 # InstCombine contributor guide
 
+```{contents}
+:depth: 4
+```
+
 This guide lays out a series of rules that contributions to InstCombine should
 follow. **Following these rules will results in much faster PR approvals.**