Glossary terms for docs

[dehann]

• DFG: DistributedFactorGraphs.jl
• AMP: ApproximateManifoldProducts.jl
• IIF: IncrementalInference.jl
• RoME: Robot Motion Estimate
• FSM: FunctionalStateMachine.jl
• KDE: KernelDensityEstimate.jl
• CSM: Clique State Machine

[GearsAD]

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