Doc comments for API interface are too thin

[atc0005]

go-teams-notify/send.go

Lines 87 to 95 in eaab5cd

	// API - interface of MS Teams notify
	type API interface {
	Send(webhookURL string, webhookMessage MessageCard) error
	SendWithContext(ctx context.Context, webhookURL string, webhookMessage MessageCard) error
	SendWithRetry(ctx context.Context, webhookURL string, webhookMessage MessageCard, retries int, retriesDelay int) error
	SkipWebhookURLValidationOnSend(skip bool) API
	AddWebhookURLValidationPatterns(patterns ...string) API
	ValidateWebhook(webhookURL string) error
	}

This is functional and was likely fine when the API surface was smaller, but should be extended to cover existing functionality.