mavproxy: Document how to graph NAMED_VALUE_FLOAT

Signed-off-by: Ryan Friedman <25047695+Ryanf55@users.noreply.github.com>
ArduPilot · Jan 9, 2025 · d4e6e3b · d4e6e3b
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diff --git a/mavproxy/source/docs/modules/graph.rst b/mavproxy/source/docs/modules/graph.rst
@@ -51,3 +51,8 @@ To set the tickresolution along the horizontal axis (1/<number of ticks>):
 
     graph timespan 0.2
        
+To graph a ``NAMED_VALUE_FLOAT`` that has a key ``MY_KEY``, which can be used for freeform data:
+
+.. code:: bash
+
+    graph NAMED_VALUE_FLOAT[MY_KEY].value