fix: correct broken documentation links

- Fix relative paths in apps/grpc/README.md (../../../ -> ../../)
- Add missing .md extension in docs/guides/full-node.md link
- Wrap localhost URL in backticks in tools/da-debug/README.md

Author: randygrok

apps/grpc/README.md

@@ -150,5 +150,5 @@ If you have issues connecting to the DA layer:
 ## See Also
 
 - [Evolve Documentation](https://ev.xyz)
-- [gRPC Execution Interface](../../../execution/grpc/README.md)
-- [Single Sequencer Documentation](../../../sequencers/single/README.md)
+- [gRPC Execution Interface](../../execution/grpc/README.md)
+- [Single Sequencer Documentation](../../sequencers/single/README.md)

docs/guides/full-node.md

@@ -4,7 +4,7 @@
 
 This guide covers how to set up a full node to run alongside a sequencer node in a Evolve-based blockchain network. A full node maintains a complete copy of the blockchain and helps validate transactions, improving the network's decentralization and security.
 
-> **Note: The guide on how to run an evolve EVM full node can be found [in the evm section](./evm/single#setting-up-a-full-node).**
+> **Note: The guide on how to run an evolve EVM full node can be found [in the evm section](./evm/single.md#setting-up-a-full-node).**
 
 ## Prerequisites
 

tools/da-debug/README.md

@@ -75,7 +75,7 @@ da-debug search 100 "0x000000000000000000000000000000000000000000000000000000746
 
 All commands support these global flags:
 
-- `--da-url string`: Celestia node RPC URL (default: "http://localhost:26658")
+- `--da-url string`: Celestia node RPC URL (default: `http://localhost:26658`)
 - `--auth-token string`: Authentication token for Celestia node
 - `--timeout duration`: Request timeout (default: 30s)
 - `--verbose`: Enable verbose logging