Update the pip.md file on how to automatically add cuda/dnn path

Fixes tensorflow/tensorflow#60183
Modified the below lines
CUDNN_PATH=$(dirname $(python -c "import nvidia.cudnn;print(nvidia.cudnn.__file__)"))
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CONDA_PREFIX/lib/:$CUDNN_PATH/lib

with these lines of code
mkdir -p $CONDA_PREFIX/etc/conda/activate.d
echo 'CUDNN_PATH=$(dirname $(python -c "import nvidia.cudnn;print(nvidia.cudnn.__file__)"))' > $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
echo 'export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CONDA_PREFIX/lib/:$CUDNN_PATH/lib' >> $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh

Author: synandi

site/en/install/pip.md

@@ -28,8 +28,9 @@ step-by-step instructions.
     ```bash
     conda install -c conda-forge cudatoolkit=11.8.0
     python3 -m pip install nvidia-cudnn-cu11==8.6.0.163 tensorflow==2.12.*
-    CUDNN_PATH=$(dirname $(python -c "import nvidia.cudnn;print(nvidia.cudnn.__file__)"))
-    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CONDA_PREFIX/lib/:$CUDNN_PATH/lib
+    mkdir -p $CONDA_PREFIX/etc/conda/activate.d
+    echo 'CUDNN_PATH=$(dirname $(python -c "import nvidia.cudnn;print(nvidia.cudnn.__file__)"))' > $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
+    echo 'export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CONDA_PREFIX/lib/:$CUDNN_PATH/lib' >> $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
     # Verify install:
     python3 -c "import tensorflow as tf; print(tf.config.list_physical_devices('GPU'))"
     ```
@@ -75,8 +76,9 @@ step-by-step instructions.
     ```bash
     conda install -c conda-forge cudatoolkit=11.8.0
     python3 -m pip install nvidia-cudnn-cu11==8.6.0.163 tensorflow==2.12.*
-    CUDNN_PATH=$(dirname $(python -c "import nvidia.cudnn;print(nvidia.cudnn.__file__)"))
-    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CONDA_PREFIX/lib/:$CUDNN_PATH/lib
+    mkdir -p $CONDA_PREFIX/etc/conda/activate.d
+    echo 'CUDNN_PATH=$(dirname $(python -c "import nvidia.cudnn;print(nvidia.cudnn.__file__)"))' > $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
+    echo 'export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CONDA_PREFIX/lib/:$CUDNN_PATH/lib' >> $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
     # Verify install:
     python3 -c "import tensorflow as tf; print(tf.config.list_physical_devices('GPU'))"
     ```