add variable and method comments

internal/metal/providers/emgql/client.go

@@ -14,12 +14,14 @@ const (
 	defaultHTTPTimeout = 5 * time.Second
 )
 
+// DefaultHTTPClient is the default http client used if no client is provided.
 var DefaultHTTPClient = &http.Client{
 	Timeout: defaultHTTPTimeout,
 }
 
 var _ providers.Provider = &Client{}
 
+// Client is the client to interact with the equinix metal graphql service.
 type Client struct {
 	logger     *zap.SugaredLogger
 	httpClient *http.Client