Change builds-doc.yaml torch install order, remove rdma-core-dev from instructions (#1745)

Summary:
Pull Request resolved: #1745

This diff tries to fix the discrepancy between build-*.yaml and the doc+build.yaml workflows by installing torch nightly first.

Also removes an incorrect instruction in the README.

Reviewed By: amirafzali, shayne-fletcher

Differential Revision: D86119065

fbshipit-source-id: 2824fc56c8e37a9df7d3245dd5da7e4a8317fb54

Author: allenwang28

.github/workflows/doc_build.yml

@@ -30,6 +30,9 @@ jobs:
         # docs build will use 3.13
         setup_build_environment 3.13
 
+        # Install PyTorch with CUDA support (matching build-cuda.yml)
+        pip install --pre torch --index-url https://download.pytorch.org/whl/nightly/cu126
+
         # Setup Tensor Engine
         setup_tensor_engine
 
@@ -38,9 +41,6 @@ jobs:
         pip install -r build-requirements.txt
         pip install -r docs/requirements.txt
 
-        # Install PyTorch with CUDA support (matching build-cuda.yml)
-        pip install --pre torch --index-url https://download.pytorch.org/whl/nightly/cu126
-
         # Set environment variables for CUDA build
         export USE_CUDA=1
         export USE_TENSOR_ENGINE=1

README.md

@@ -55,7 +55,7 @@ Stable and nightly distributions require libmxl and libibverbs (runtime).
 `sudo dnf install -y libibverbs rdma-core libmlx5 libibverbs-devel rdma-core-devel`
 
 ## Ubuntu
-`sudo apt install -y rdma-core libibverbs1 libmlx5-1 libibverbs-dev rdma-core-dev`
+`sudo apt install -y rdma-core libibverbs1 libmlx5-1 libibverbs-dev`
 
 ### Stable