* Spellcheck HBS templates and fix vars

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add test for benchmark-storage

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fmt templates

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* fmt

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Review fixes

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>