fix links

NetcodeSamples/README.md

@@ -1,5 +1,7 @@
 ### Unity Netcode for Entities Samples
 
+*For more Netcode and DOTS starter material, see the [main page of this repo](../README.md).*
+
 The Netcode for Entities package provides the multiplayer features needed to implement
 world synchronization in an [entities]((https://docs.unity3d.com/Packages/com.unity.entities@latest))-based multiplayer game. It uses the transport package
 for the socket level functionality, Unity Physics for networked physics simulation, Logging package for packet dump logs. Key Netcode for Entities features include:

PhysicsSamples/README.md

@@ -1,5 +1,7 @@
 # Unity Physics Samples
 
+*For more Phyiscs and DOTS starter material, see the [main page of this repo](../README.md).*
+
 ## Controls 
 
 In the *Game* window:

README.md

@@ -1,17 +1,16 @@
 
+*The sample projects in this repo use Unity 6.0 and the 1.3 releases of the `Entities`, `Netcode`, `Physics`, and `Entities.Graphics` packages.*
+
 # DOTS Samples
 
-The DOTS package sample projects contain many small samples that cover most of the package functionality:
+The DOTS package sample projects contain many small samples that cover most of the functionality in the packages:
 
 - [Entities samples](./EntitiesSamples/README.md)
 - [Physics samples](./PhysicsSamples/README.md)
 - [Netcode samples](./NetcodeSamples/README.md)
 - [Entities.Graphics HDRP samples](./GraphicsSamples/HDRPSamples/README.md)
 - [Entities.Graphics URP samples](./GraphicsSamples/URPSamples/README.md)
 
-*The sample projects in this repo use Unity 6.0 and the 1.3 releases of the `Entities`, `Netcode`, `Physics`, and `Entities.Graphics` packages.*
-
-
 For those new to DOTS, we recommend starting with the DOTS 101 sample projects and materials:
 
 ## The Job System 101
@@ -35,7 +34,7 @@ For those new to DOTS, we recommend starting with the DOTS 101 sample projects a
 Additional Entities material on Unity Learn:
 
 - [Tanks tutorial](https://learn.unity.com/tutorial/65b3e48fedbc2a611fc291a7) and [walkthrough video](https://youtu.be/jAVVxoWU5lo) (23 minutes)
-- [DOTS Bootcamp](https://learn.unity.com/tutorial/dots-bootcamp) ([code](./Dots101/Entities101/Assets/Firefighters/))
+- [DOTS Bootcamp](https://learn.unity.com/tutorial/dots-bootcamp) ([code](./Dots101/Entities101/Assets/Firefighters/README.md))
 
 ## Physics 101
 
@@ -46,7 +45,7 @@ Additional Entities material on Unity Learn:
 
 - [Document: Unity Netcode for Entities 101](https://docs.google.com/document/d/17AYh_Lc7Phgtg66sX9TrSrtCS7PZn0y-XuVL2A6cXCw/edit?usp=sharing)
 - [Sample project: Unity Netcode for Entities 101](./Dots101/Netcode101/)
-- [Video: Netcode 101]()
+- [Video: Netcode 101](https://youtu.be/f-4NR30ieWg)
 
 ## Additional content