Change Chainstack to free tier

Chainstack has a complete free tier plan, not a free trial where you can get a completely free Ronin node on the free tier Developer plan.

Signed-off-by: Ake <[email protected]>

Author: akegaviar

docs/developers/tools/node-providers.md

@@ -26,7 +26,7 @@ Chainstack offers RPC & WS nodes with a free tier available and supports social
 
 | | |
 | ----- | ----- |
-| Free trial | ✅ |
+| Free tier | ✅ |
 | Archive node | ✅ |
 | Websocket | ✅ |
 | Testnet | ✅ |
@@ -82,4 +82,4 @@ Integrate a high-performance production Node RPC with built-in debugging tools a
 | Free trial | ✅ |
 | Archive node | ✅ |
 | Websocket | ✅ |
-| Testnet | ✅ |
+| Testnet | ✅ |