doc: add note to printSchema about the missing directives

[YassinEldeeb]

This adds jsDoc to the printSchema to raise awareness that it won't include directives like the @oneOf directive.

If the user intended to have those directives then use the printSchemaWithDirectives instead.

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[benjie]

This adds jsDoc to the printSchema to raise awareness that it won't include directives like the @OneOf directive.

That example is not accurate; the @oneOf directive should be output by printSchema in the same way that a @deprecated directive should. However it is currently true for directives that are not built in.

[yaacovCR]

Fixed by #3969 => closing this PR.

Thanks for pointing this out, glad this is fixed!