DOCSP-42501 fixes command mistype in mongosh install doc (#347)

Author: jmd-mongo

source/includes/steps-install-shell-base.yaml

@@ -23,7 +23,7 @@ content: |
      .. code-block:: sh
 
        sudo cp mongosh /usr/local/bin/
-       sudo cp mongosh_crypt_v1.dylib /usr/local/lib/
+       sudo cp mongosh_crypt_v1.so /usr/local/lib/
 
    - Create symbolic links to the ``MongoDB Shell``. Switch to the
      directory where you extracted the files from the ``.tgz`` archive.