Change NoInit warning from danger to warn block

- Use !!!warn instead of !!!danger for consistency with documentation style
- Maintains the same strong warning message about NoInit risks

Author: ChrisRackauckas

docs/src/features/dae_initialization.md

@@ -33,7 +33,7 @@ DiffEqBase.ShampineCollocationInit
 
 ## ⚠️ WARNING: NoInit Usage
 
-!!! danger "Use NoInit at your own risk"
+!!! warn "Use NoInit at your own risk"
     **`NoInit()` should almost never be used.** No algorithm has any guarantee of correctness if `NoInit()` is used with inconsistent initial conditions. Users should almost always use `CheckInit()` instead for safety.
 
     **Important:**