Drop the migration.md addition; the guide is closed to new entries

Keep the one-word correction to the SEP-2164 sentence (static resources
now pass ResourceNotFoundError through too), remove the added clause
about FunctionResource.read()/FileResource.read().

No-Verification-Needed: docs-only change

Author: maxisbey

docs/migration.md

@@ -1018,7 +1018,7 @@ except MCPError as e:
 
 Reading a missing resource now returns JSON-RPC error code `-32602` (invalid params) with the requested URI in `error.data` (`{"uri": ...}`), per [SEP-2164](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2164). Previously the server returned code `0` with no `data`. Clients can now reliably distinguish not-found from other errors; a resource handler (static or template) that raises `ResourceNotFoundError` (from `mcp.server.mcpserver.exceptions`) produces this same response.
 
-The underlying lookups now raise typed exceptions instead of `ValueError`. `ResourceManager.get_resource()` raises `ResourceNotFoundError` when no resource or template matches the URI, and `ResourceTemplate.create_resource()` raises `ResourceError` when the template function fails. Neither subclasses `ValueError`, so callers catching `ValueError` should switch to `ResourceNotFoundError` / `ResourceError` (both importable from `mcp.server.mcpserver.exceptions`; `ResourceNotFoundError` subclasses `ResourceError`). Likewise, `FunctionResource.read()` and `FileResource.read()` no longer wrap failures in `ValueError`: called directly they raise whatever the function or file read raised, and through `MCPServer.read_resource()` that arrives as `UnexpectedResourceError` (a `ResourceError`) with the original as `__cause__`.
+The underlying lookups now raise typed exceptions instead of `ValueError`. `ResourceManager.get_resource()` raises `ResourceNotFoundError` when no resource or template matches the URI, and `ResourceTemplate.create_resource()` raises `ResourceError` when the template function fails. Neither subclasses `ValueError`, so callers catching `ValueError` should switch to `ResourceNotFoundError` / `ResourceError` (both importable from `mcp.server.mcpserver.exceptions`; `ResourceNotFoundError` subclasses `ResourceError`).
 
 ### `Resource` classes reject unknown keyword arguments