docs(code): change jsonc code blocks language identifier

[ClxUne09]

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Description

Changed language identifiers for JSONC code blocks in documentation from json to jsonc to reflect the file format change and ensure correct syntax highlighting.

[ClxUne09]

I think the default Markdown with JSX (MDX) and Markdown (MD) renderers don't support the JSON with comments (jsonc) code identifier, unlike modern renderers (e.g., VS Code). This means they won't apply syntax highlighting for jsonc.

Additionally, I made some incorrect changes to the wrong code blocks, including inline code highlighting (e.g., //highlight-start).