docs(graphql): `Printer` class reference fix. #431

Job	Run time
Settings / Detect Packages	7s
Sync package: core	15s
Sync package: documentator	10s
Sync package: eloquent	14s
Sync package: formatter	9s
Sync package: graphql-printer	7s
Sync package: graphql	20s
Sync package: migrator	12s
Sync package: queue	11s
Sync package: serializer	7s
Sync package: spa	10s
Sync package: testing	10s
	2m 12s

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