Update Accept-Encoding docs

Author: yoshuawuyts

src/content/encoding_proposal.rs

@@ -4,7 +4,7 @@ use crate::headers::HeaderValue;
 
 use std::cmp::{Ordering, PartialEq};
 
-/// A proposed encoding.
+/// A proposed `Encoding` in `AcceptEncoding`.
 #[derive(Debug, Clone, PartialEq)]
 pub struct EncodingProposal {
     /// The proposed encoding.

src/content/mod.rs

@@ -1,10 +1,18 @@
 //! HTTP Content headers.
+//!
+//! These headers are used for "content negotiation": the client shares information
+//! about which content it prefers, and the server responds by sharing which
+//! content it's chosen to share. This enables clients to receive resources with the
+//! best available compression, in the preferred language, and more.
 
+pub mod accept_encoding;
 pub mod content_encoding;
 
 mod encoding;
 mod encoding_proposal;
 
+#[doc(inline)]
+pub use accept_encoding::AcceptEncoding;
 #[doc(inline)]
 pub use content_encoding::ContentEncoding;
 pub use encoding::Encoding;