chore(channel): Fix typo (#2141)

Author: tottoto

tonic/src/transport/channel/service/add_origin.rs

@@ -53,7 +53,7 @@ where
         head.uri = {
             // Split the request URI into parts.
             let mut uri: http::uri::Parts = head.uri.into();
-            // Update the URI parts, setting hte scheme and authority
+            // Update the URI parts, setting the scheme and authority
             uri.scheme = self.scheme.clone();
             uri.authority = self.authority.clone();