fix typo (#188)

Author: rkakamilan

distributional_graphormer/protein-ligand/README.md

@@ -11,7 +11,7 @@ Dataset should be extracted to the `dig/protein-ligand/src/dataset` directory.
    ```bash
    cd dig/protein-ligand/src
    # download the dataset.tar file
-   wget https://ai4scienceasiaedp.blob.core.windows.net/dig/dig/protein-ligand/dataset.tar$SAS" -O dataset.tar
+   wget "https://ai4scienceasiaedp.blob.core.windows.net/dig/dig/protein-ligand/dataset.tar$SAS" -O dataset.tar
    tar -xvf dataset.tar
    ```
 
@@ -24,7 +24,7 @@ Checkpoint should be placed in the `dig/protein-ligand/src/saved_checkpoints` di
    ```bash
    cd dig/protein-ligand/src
    # download the saved_checkpoints.tar file
-   wget https://ai4scienceasiaedp.blob.core.windows.net/dig/dig/protein-ligand/saved_checkpoints.tar$SAS" -O saved_checkpoints.tar
+   wget "https://ai4scienceasiaedp.blob.core.windows.net/dig/dig/protein-ligand/saved_checkpoints.tar$SAS" -O saved_checkpoints.tar
    tar -xvf saved_checkpoints.tar
    ```
 
@@ -75,7 +75,7 @@ We provide a Docker image with installed dependencies for running the scripts.
 To use the Docker image, follow these steps:
 
    ```bash
-   wget https://ai4scienceasiaedp.blob.core.windows.net/dig/dig/protein-ligand/dig-prolig-docker.tar$SAS" -O dig-prolig-docker.tar
+   wget "https://ai4scienceasiaedp.blob.core.windows.net/dig/dig/protein-ligand/dig-prolig-docker.tar$SAS" -O dig-prolig-docker.tar
    docker load < dig-prolig-docker.tar
    cd dig/protein-ligand/src
    docker run -it --gpus all --ipc=host -v $(pwd):/workspace dig/dig-prolig