internal/jsonrpc2,mcp: fix typos

[zchee]

This pull request includes various documentation updates and minor code adjustments to improve clarity and consistency across the codebase. The changes focus on refining comments, fixing references, and correcting naming conventions.

Documentation Updates:

• mcp/server.go: Updated comments to remove references to [Server.Start] and use [Server.Run] consistently, ensuring alignment with the current implementation. [1] [2]
• mcp/server.go: Changed the reference from [idContext] to [idContextKey] for better clarity in comments about request ID handling.
• mcp/shared.go: Improved comments to use square brackets around type names ([ClientSession], [ServerSession], [MethodHandler]) for consistency with documentation conventions. [1] [2]
• mcp/transport.go: Updated comments to clarify implementation details, such as changing Preempt implements jsonrpc2.Preempter to Preempt implements [jsonrpc2.Preempter].

Code Adjustments:

• internal/jsonrpc2/conn.go: Fixed panic message strings to remove _v2 suffix for consistency with the current naming conventions. [1] [2]
• mcp/transport.go: Renamed middleware function descriptions in comments (loggingReader → Read, loggingWriter → Write) to match method names directly. [1] [2]

[zchee]

Is this correct English?

[jba]

Yes!

[jba]

Your commit message looks like it was written by AI. It's very clear, but too wordy. You could have written:

mcp, jsonrpc: minor wording improvements

- add links to doc strings
- use correct symbol and package names