docs(shim-protos): fix stale README commands

[immanuwell]

README has a few stale shim-protos bits, so following it from repo root goes sideways a bit.

Fixes:

• use the real crate name containerd-shim-protos
• drop the non-existent generate_bindings feature
• point example commands at the actual built example path
• bump the README version snippet to 0.11

How to repro:

1. Run cargo +stable build -p containerd-shim-protos --features generate_bindings
   It fails because that feature does not exist
2. Run cargo +stable info containerd-shim-client
   It fails because that crate is not published
3. Follow ./shim-proto-connect ...
   That path is a miss, the binary is under target/debug/examples/

Checked:

• cargo +stable build -p containerd-shim-protos --example shim-proto-connect
• cargo +stable build -p containerd-shim-protos --example shim-proto-connect-async --features async