Docs: Plane: Add hint to solve 1Hz pitch oscillations #6558
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caused by autotune.
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This patch adds a warning about a nasty side effect of Autotune.
I had the situation that I was through with tuning by documentation, then flew a longer distance straight and the plane started to oscillate over 5deg pitch and 1m altitude at 1Hz.
The cause was that Autotune did copy the FF value to the I-Gain which was >150% of the P-Gain.
I'm not sure if I got the cross-side link correctly. Please advice and I'll rework as necessary.