Incomplete docs in FAQS

[jonathanfischer97]

The section in the FAQs docs is incomplete, here: https://juliareach.github.io/ReachabilityAnalysis.jl/dev/man/faq/#Can-I-use-ODE-solvers-with-interval-initial-conditions?:~:text=%22y%22)-,Modeling%20questions,Although%20it%20is%20in%20principle%20possible%20to%20ODE%20solvers%20for,-How%20do%20I