Fixing warning in command SubtractAssetQuantity, removing unnecessarily includes, small documentation change #3159

Job	Run time
pr_comment_reaction_rocket	0s
Pull requests from forks should use other workflow	1s
Check if github workflows were properly made from sources	20s
generate_matrixes	8s
Docker-iroha-builder	1m 23s
prepare-windows-env	5s
prepare-macos-env	4s
build-M (macos clang Debug normal)	1h 13m 40s
build-W	0s
build-UD	0s
build-UR	0s
docker-D	0s
docker-R	0s
	1h 15m 41s

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