Invalid Help String

[pratham15541]

Both disk gauges have memory help text

        "mem_total": prometheus.NewGauge(prometheus.GaugeOpts{
			Subsystem: "os",
			Help:      "Total amount of RAM",
			Name:      "mem_total",
		}),
		"mem_used": prometheus.NewGauge(prometheus.GaugeOpts{
			Subsystem: "os",
			Help:      "RAM used by programs",
			Name:      "mem_used",
		}),
		"disk_total": prometheus.NewGauge(prometheus.GaugeOpts{
			Subsystem: "os",
			Help:      "Total amount of RAM",
			Name:      "disk_total",
		}),
		"disk_used": prometheus.NewGauge(prometheus.GaugeOpts{
			Subsystem: "os",
			Help:      "RAM used by programs",
			Name:      "disk_used",
		}),