fix futures link in cargo-workspace's page

Author: sunhuachuang

src/rust-2018/cargo-and-crates-io/cargo-workspaces-for-multi-package-projects.md

@@ -11,8 +11,8 @@ Cargo now has an additional level:
 
 * A *workspace* contains one or more packages
 
-This can be useful for larger projects. For example, [the `futures`
-respository] is a *workspace* that contains many related packages:
+This can be useful for larger projects. For example, [the `futures` package]
+is a *workspace* that contains many related packages:
 
 * futures
 * futures-util
@@ -27,4 +27,4 @@ Workspaces allow these packages to be developed individually, but they share
 a single set of dependencies, and therefore have a single target directory
 and a single `Cargo.lock`.
 
-For more details about workspaces, please see [the Cargo documentation](https://doc.rust-lang.org/stable/cargo/reference/manifest.html#the-workspace-section).
+For more details about workspaces, please see [the Cargo documentation](https://doc.rust-lang.org/stable/cargo/reference/manifest.html#the-workspace-section).