Docs: Add more detail about mapping olhc values (#78963)

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

@@ -51,17 +51,29 @@ The **Up color** and **Down color** options select which colors are used when th
 
 ## Open, High, Low, Close
 
-The candlestick visualization will attempt to map fields to the appropriate dimension. The **Open**, **High**, **Low**, and **Close** options allow you to map your data to these dimensions if the panel is unable to do so.
+The candlestick visualization will attempt to map fields from your data to the appropriate dimension:
-
-{{% admonition type="note" %}}
-These values are hidden from the legend.
-{{% /admonition %}}
 
 - **Open** corresponds to the starting value of the given period.
 - **High** corresponds to the highest value of the given period.
 - **Low** corresponds to the lowest value of the given period.
 - **Close** corresponds to the final (end) value of the given period.
-- **Volume** corresponds to the sample count in the given period. (e.g. number of trades)
+- **Volume** corresponds to the sample count in the given period. (for example, number of trades)
+
+{{% admonition type="note" %}}
+The candlestick visualization legend doesn't display these values.
+{{% /admonition %}}
+
+To properly map these dimensions, the query results table from your data must include _at least_ the following columns:
+
+- timestamp
+- open
+- high
+- low
+- close
+
+If your data can't be mapped to these dimensions for some reason (for example, because the column names aren't the same), you can map them manually using the **Open**, **High**, **Low**, and **Close** fields under the **Candlestick** options in the panel editor:
+
+![Open, High, Low, and Close fields in the panel editor](/media/docs/grafana/panels-visualizations/screenshot-olhc-options-10.3.png)
 
 ## Additional fields