updated docs

docs/sources/reference/graph.md

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+---
+title: Docs - Graphing
+---
+
+# Graphing
+
+The main panel for in Grafana is simply named Graph. It provides a very rich set of graphing options.
+
+<img src="/img/v1/graph_overview.png" class="no-shadow">
+
+## Axes, Grid & Legend options
+![](/img/v1/graph_axes_grid_options.png)
+
+### Legens values
+
+Check ``Include Values`` under legend styles.
+
+- Total   - Sum of all values returned from metric query
+- Current - Last value returned from the metric query
+
+This means that if your series represents a rate, for example requests / second then the Total in the legend will
+not represent the total number of requests. It is just the sum of all data points.
+
+
+## Display options
+![](/img/v1/graph_display_styles.png)
+
+If you have stack enabled you can select what the mouse hover feature should show.
+
+- Cumulative - Sum of series below plus the series you hover over
+- Individual - Just the value for the series you hover over
+