docs: add push_preview and fix formatting friction tutorial

Author: Sathvik Bhagavan

docs/make.jl

@@ -29,5 +29,6 @@ makedocs(;
 
 deploydocs(;
     repo = "github.com/SciML/ModelingToolkitNeuralNets.jl",
-    devbranch = "main"
+    devbranch = "main",
+    push_preview = true
 )

docs/src/friction.md

@@ -152,6 +152,7 @@ res_prob = remake(prob, p = res_p)
 res_sol = solve(res_prob, Rodas4(), saveat = sol_ref.t)
 @test first.(sol_ref.u)≈first.(res_sol.u) rtol=1e-3 #hide
 @test friction.(first.(sol_ref.u))≈(Fu .- first.(res_sol(res_sol.t, Val{1}).u)) rtol=1e-1 #hide
+nothing #hide
 ```
 
 Also, it would be interesting to check the simulation before the training to get an idea of the starting point of the network.