Fix JSON comments

Author: Andrea Scuderi

README.md

@@ -48,7 +48,7 @@ sourcekit-lsp configuration file example: `sourcekit-lsp/config.json`
 
 launch.json example: `.vscode/launch.json`
 
-```json
+```jsonc
 {
     "configurations": [
         {
@@ -85,7 +85,7 @@ launch.json example: `.vscode/launch.json`
 ### 7. Modify the `devcontainer.json` to include the Swift extension and configure the lldb library path.
 
 Add the following to `devcontainer.json` to allow Swift debugging and Swift extension installation:
-```json
+```jsonc
    "customizations": {
         // Configure properties specific to VS Code.
         "vscode": {
@@ -102,7 +102,7 @@ Add the following to `devcontainer.json` to allow Swift debugging and Swift exte
 ```
 
 final `devcontainer.json` example:
-```json
+```jsonc
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the
 // README at: https://github.com/devcontainers/templates/tree/main/src/docker-outside-of-docker-compose
 {