Fix broken TLS anchor link in docs overview

Now correctly links to:
https://docs.rs/ureq/latest/ureq/#https--tls--ssl

Introduced in 56276c3742.

Also fixes a rustdoc typo spotted by my IDE's spell checker whilst the
project was open.

src/lib.rs

@@ -17,7 +17,7 @@
 //! Ureq is in pure Rust for safety and ease of understanding. It avoids using
 //! `unsafe` directly. It [uses blocking I/O][blocking] instead of async I/O, because that keeps
 //! the API simple and and keeps dependencies to a minimum. For TLS, ureq uses
-//! [rustls or native-tls](#tls).
+//! [rustls or native-tls](#https--tls--ssl).
 //!
 //! Version 2.0.0 was released recently and changed some APIs. See the [changelog] for details.
 //!

src/response.rs

@@ -152,7 +152,7 @@ impl Response {
     /// The header value for the given name, or None if not found.
     ///
     /// For historical reasons, the HTTP spec allows for header values
-    /// to be encoded using encodigs like iso-8859-1. Such encodings
+    /// to be encoded using encodings like iso-8859-1. Such encodings
     /// means the values are not possible to interpret as utf-8.
     ///
     /// In case the header value can't be read as utf-8, this function