docs(common): fixes openzeppelin examples and some basic mistakes ins… #262

Job	Run time
check-changes-tx-sender / check-changes	35s
check-changes-db-migration / check-changes	37s
check-changes-kms-worker / check-changes	41s
check-changes-gw-listener / check-changes	40s
is-latest-commit / check	4s
build-decisions	3s
re-tag-db-migration-image	0s
build-tx-sender	0s
re-tag-gw-listener-image	0s
build-kms-worker	0s
build-db-migration	0s
re-tag-kms-worker-image	0s
re-tag-tx-sender-image	0s
build-gw-listener	0s
	2m 40s

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