Update RECIPE_ROOT path in README.md

Author: incredere

training/a4/llama3-1-70b/nemo-pretraining-gke/2node-bf16-seq8192-gbs1024/README.md

@@ -71,7 +71,7 @@ Clone the `gpu-recipes` repository and set a reference to the recipe folder.
 git clone https://github.com/ai-hypercomputer/gpu-recipes.git
 cd gpu-recipes
 export REPO_ROOT=`git rev-parse --show-toplevel`
-export RECIPE_ROOT=$REPO_ROOT/training/a4/llama3-1-70b-seq8192-gbs1024-mbs1-gpus16/nemo-pretraining-gke/2_nodes
+export RECIPE_ROOT=$REPO_ROOT/training/a4/llama3-1-70b/nemo-pretraining-gke/2node-bf16-seq8192-gbs1024
 cd $RECIPE_ROOT
 ```