message: Remove reference to `use_bazel.sh` from install_tink_via_pip.sh instructions
diff: #
  # NOTES:
  # * If not running on Kokoro, this script will do nothing.
  -# * This script MUST be sourced to update the environment of the calling
  +# * This script *must* be sourced to update the environment of the calling
  # script.
  -# * The required Bazel version *must* be installed before running this script
  -# with:
  -# use_bazel.sh "$(cat <path to version file>/.bazelversion)"
  +# * The required Bazel version *must* be installed before running this script.
  #
  # Usage:
  # source ./kokoro/testutils/install_tink_via_pip.sh <path to tink python root>
  