Improve readme and changelog.

Author: abizjak

CHANGELOG.md

@@ -8,8 +8,9 @@
   only blockstate usable.
 - Fix a memory leak that could occur in certain usage scenarios involving smart
   contracts.
-- Implementation of the the V2 GRPC API. This adds a number of new configuration
-  options for the node. These are detailed in [grpc2.md](https://github.com/Concordium/concordium-node/blob/main/docs/grpc2.md)
+- Support for a new GRPC API which uses typed proto definitions. This adds a
+  number of new configuration options for the node. These are detailed in
+  [grpc2.md](https://github.com/Concordium/concordium-node/blob/main/docs/grpc2.md)
 
 ## 4.4.4
 

docs/grpc2.md

@@ -31,7 +31,7 @@ If these are enabled then the following options become available
 - `--grpc2-enable-grpc-web` (`CONCORDIUM_NODE_GRPC2_ENABLE_GRPC_WEB`) if set,
   enables the server support for [grpc-web](https://github.com/grpc/grpc-web)
   over HTTP 1.1. This allows the node's API to be used directly from a browser.
-- `--grpc2-health-max-finalized-delay`
+- `--grpc2-health-max-finalized-delay` (default is 5min)
   (`CONCORDIUM_NODE_GRPC2_HEALTH_MAX_FINALIZED_DELAY`) is a configuration for the
   `GetNodeHealth` endpoint. It specifies (in seconds) the maximum delay in last
   finalized block time before the health check fails.