acceptor: fix nightly doc_overindented_list_items warns

[cpu]

Of the form:

warning: doc list item overindented
   --> librustls/src/acceptor.rs:219:9
    |
219 |     ///      with rustls_accepted_into_connection.
    |         ^^^^^ help: try using `   ` (3 spaces)
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_overindented_list_items
    = note: `#[warn(clippy::doc_overindented_list_items)]` on by default

Nightly clippy has been emitting these on main since ~today.

[cpu]

Heh, fun Windows CI flake from curl/schannel:

curl -L "$env:LINK/$env:CARGO_C_FILE" -o cargo-c-windows-msvc.zip
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (35) schannel: next InitializeSecurityContext failed: CRYPT_E_REVOCATION_OFFLINE (0x80092013) - The revocation function was unable to check revocation because the revocation server was offline.

Guessing that's OCSP? 🤷

[ctz]

Guessing that's OCSP? 🤷

😂

[icing]

Yeah, Schannel is quite an amusing backend.💁🏻‍♂️