add a bit more docs

src/cargo/util/config.rs

@@ -1860,7 +1860,7 @@ pub fn clippy_driver() -> PathBuf {
 ///
 /// ```text
 /// [http]
-/// ssl-version = "tlsv.13"
+/// ssl-version = "tlsv1.3"
 /// ```
 ///
 /// ```text

src/doc/src/reference/config.md

@@ -107,8 +107,13 @@ proxy = "host:port" # HTTP proxy to use for HTTP requests (defaults to none)
 timeout = 30        # Timeout for each HTTP request, in seconds
 cainfo = "cert.pem" # Path to Certificate Authority (CA) bundle (optional)
 check-revoke = true # Indicates whether SSL certs are checked for revocation
-ssl-version = "tlsv1.3"  # Indicates which SSL version to use (defaults to
-                         # "default", "tlsv1", "tlsv1.0", "tlsv1.1", "tlsv1.2", "tlsv1.3")
+ssl-version = "tlsv1.3" # Indicates which SSL version or above to use (options are
+                        # "default", "tlsv1", "tlsv1.0", "tlsv1.1", "tlsv1.2", "tlsv1.3")
+                        # To better control SSL version, we can even use
+                        # `ssl-version.min = "..."` and `ssl-version.max = "..."`
+                        # where "..." is one of the above options. But note these two forms
+                        # ("setting `ssl-version`" and "setting both `min`/`max`)
+                        # can't co-exist.
 low-speed-limit = 5 # Lower threshold for bytes/sec (10 = default, 0 = disabled)
 multiplexing = true # whether or not to use HTTP/2 multiplexing where possible
 

tests/testsuite/config.rs

@@ -849,9 +849,6 @@ hello = 'world'
         .get::<Option<SslVersionConfig>>("http.ssl-version")
         .unwrap()
         .is_none());
-
-    let b = config.get_string("http.ssl-version").unwrap();
-    println!("b: {:?}", if b.is_some() { "some" } else { "none" });
 }
 
 #[cargo_test]