message: [Doc] Change aarch assert sign output folder
diff: @@ -115,7 +115,7 @@ The gbuild invocations below <b>DO NOT DO THIS</b> by default.
  mv build/out/pivx-*.tar.gz build/out/pivx-*.dmg ../
  ./bin/gbuild --memory 3000 --commit pivx=v${VERSION} ../pivx/contrib/gitian-descriptors/gitian-aarch64.yml
  - ./bin/gsign --signer $SIGNER --release ${VERSION}-linux --destination ../gitian.sigs/ ../pivx/contrib/gitian-descriptors/gitian-aarch64.yml
  + ./bin/gsign --signer $SIGNER --release ${VERSION}-aarch64 --destination ../gitian.sigs/ ../pivx/contrib/gitian-descriptors/gitian-aarch64.yml
  mv build/out/pivx-*.tar.gz build/out/src/pivx-*.tar.gz ../
  popd
  