Update news for podo0 transit()

NEWS.md

@@ -2,8 +2,9 @@
 
 - Rework the `tad()` and related functions so they use the same
   interface as compartments (this way they do not depend on the order
-  of compartments); See #815.  Also allow dummy variables to ignore
-  state requirements (for parsing mu-referenced equations).
+  of compartments); See #815.  For mu-referencing, Also allow dummy
+  variables to ignore state requirements (ie `podo(depot)` in a single
+  line will not error when parsing mu-referenced equations).
 
 - Add `getRxNpars` to api.  This allows the development version of
   `babelmixr2` to better check what model is loaded and unload/reload
@@ -15,6 +16,9 @@
 - Bug fix for tracking time after dose when dosing to 2 compartments
   occur at the exact same time (#804, #819)
 
+- Change `transit()` model so that it uses `tad0()`, `podo0()` and
+  related functions for a bit more stable simulation and estimation
+
 # rxode2 3.0.2
 
 - Bug fix for `api`, the censoring function pointer has been updated