docs: Trend: Implement docs for v10 (#67794)

docs/sources/panels-visualizations/visualizations/trend/index.md

@@ -0,0 +1,33 @@
+---
+keywords:
+  - grafana
+  - graph panel
+  - trend panel
+  - documentation
+  - guide
+  - graph
+  - line chart
+title: Trend
+weight: 1200
+---
+
+# Trend
+
+The trend panel should be used for datasets that have a sequential, numeric X that is not time. Some examples are function graphs, rpm/torque curves, supply/demand relationships, and elevation or heart rate plots along a race course (with x as distance or duration from start).
+
+The trend panel supports all visual styles and options available in the [Time series panel]({{< relref "../time-series" >}}) with these exceptions:
+
+- No annotations or time regions
+- No shared cursor/crosshair
+- No multi-timezone x axis
+- No ability to change the dashboard time range via drag-selection
+
+## X Field selection
+
+Use this option to select a field that contains increasing numeric values.
+
+{{< figure src="/media/docs/grafana/screenshot-grafana-10-0-trend-speed-xvalue.png" max-width="750px" caption="Trend x value selection" >}}
+
+For example, you could represent engine power and torque versus speed where speed is plotted on the x axis and power and torque are plotted on the y axes.
+
+{{< figure src="/media/docs/grafana/screenshot-grafana-10-0-trend-panel-new-colors.png" max-width="750px" caption="Trend engine power and torque curves" >}}