docs: mention v10 in docs

Author: AayushSabharwal

docs/src/index.md

@@ -36,6 +36,19 @@ If you use ModelingToolkit in your work, please cite the following:
 
 ## Feature Summary
 
+!!! danger "ModelingToolkit version 10"
+    
+    ModelingToolkit version 10 just released. Please refer to the [changelog](https://github.com/SciML/ModelingToolkit.jl/blob/master/NEWS.md)
+    for a summary of the changes. Some documentation pages may be broken while downstram
+    packages update to the new version.
+
+!!! danger "Temporarily broken discrete systems"
+    
+    ModelingToolkit's support for purely explicit systems of discrete update equations
+    (ones solved via `OrdinaryDiffEqFunctionMap.jl`) is temporarily broken. While such
+    systems can be created, simplfied and solved there are issues with the naming of
+    simplified unknowns and symbolic indexing of the problem/solution.
+
 ModelingToolkit.jl is a symbolic-numeric modeling package. Thus it combines some
 of the features from symbolic computing packages like SymPy or Mathematica with
 the ideas of equation-based modeling systems like the causal Simulink and the