Clarify the behavior of the attributes field on registerOTel function

[gaspar09]

Clarify the behavior of the attributes field on registerOTel function

The attributes field passed in to registerOTel is merged with default vercel env attributes

See:

otel/packages/otel/src/sdk.ts

Lines 98 to 122 in bc65efe

	[SemanticResourceAttributes.SERVICE_NAME]: serviceName,
	// Node.
	"node.ci": process.env.CI ? true : undefined,
	"node.env": process.env.NODE_ENV,
	// Vercel.
	// https://vercel.com/docs/projects/environment-variables/system-environment-variables
	"vercel.env":
	process.env.VERCEL_ENV || process.env.NEXT_PUBLIC_VERCEL_ENV,
	"vercel.region": process.env.VERCEL_REGION,
	"vercel.runtime": runtime,
	"vercel.sha":
	process.env.VERCEL_GIT_COMMIT_SHA ||
	process.env.NEXT_PUBLIC_VERCEL_GIT_COMMIT_SHA,
	"vercel.host":
	process.env.VERCEL_URL ||
	process.env.NEXT_PUBLIC_VERCEL_URL ||
	undefined,
	"vercel.branch_host":
	process.env.VERCEL_BRANCH_URL ||
	process.env.NEXT_PUBLIC_VERCEL_BRANCH_URL ||
	undefined,
	...configuration.attributes,

[vercel]

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