Fix typo in OAS docs #1324

Job	Run time
static-analysis (8.2, cs)	38s
static-analysis (8.2, stan)	56s
static-analysis (8.2, swagger:validate)	20s
cli-tests / tests (8.2)	41s
unit-tests / tests (8.2)	52s
cli-tests / tests (8.3)	32s
api-tests / tests (8.2)	1m 21s
unit-tests / tests (8.3)	23s
api-tests / tests (8.3)	56s
db-tests (ms) / db-tests (8.2)	1m 6s
db-tests (maria) / db-tests (8.2)	36s
db-tests (ms) / db-tests (8.3)	1m 16s
db-tests (maria) / db-tests (8.3)	30s
db-tests (mysql) / db-tests (8.2)	43s
db-tests (postgres) / db-tests (8.2)	31s
db-tests (mysql) / db-tests (8.3)	37s
db-tests (postgres) / db-tests (8.3)	27s
db-tests (sqlite:ci) / db-tests (8.2)	41s
db-tests (sqlite:ci) / db-tests (8.3)	28s
upload-coverage (8.2)	35s
delete-artifacts	5s
	14m 14s

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