[doc]:fix cargo guide project to package

Author: heisen-li

src/doc/src/guide/index.md

@@ -4,8 +4,8 @@ This guide will give you all that you need to know about how to use Cargo to
 develop Rust packages.
 
 * [Why Cargo Exists](why-cargo-exists.md)
-* [Creating a New Package](creating-a-new-project.md)
-* [Working on an Existing Cargo Package](working-on-an-existing-project.md)
+* [Creating a New Package](creating-a-new-package.md)
+* [Working on an Existing Cargo Package](working-on-an-existing-package.md)
 * [Dependencies](dependencies.md)
 * [Package Layout](project-layout.md)
 * [Cargo.toml vs Cargo.lock](cargo-toml-vs-cargo-lock.md)