Add note to docs that akit fields are not tunable (#206) #1179

Job	Run time
Check & Compile	5m 33s
Build for Windows (x64)	5m 46s
WPILib: Build for Linux (x64)	1m 33s
Build for macOS (x64)	1m 51s
Build for Windows (arm64)	5m 11s
Build for Linux/AppImage (x64)	1m 48s
WPILib: Build for Linux (arm64)	1m 21s
Build for macOS (arm64)	1m 51s
Build for Linux/AppImage (arm64)	1m 38s
Build for Linux/AppImage (armv7l)	2m 8s
WPILib: Build for macOS (x64)	1m 47s
WPILib: Build for Windows (x64)	5m 1s
WPILib: Build for macOS (arm64)	2m 57s
WPILib: Build for Windows (arm64)	5m 23s
Finalize Release	0s
	43m 48s

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