Fix a doc link

Author: tbu-

src/cargo/core/registry.rs

@@ -354,7 +354,7 @@ To change the dependency graph via an override it's recommended to use the
 `[replace]` feature of Cargo instead of the path override feature. This is
 documented online at the url below for more information.
 
-http://doc.crates.io/specifying-dependencies.html#overriding-dependencies
+https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#overriding-dependencies
 ";
 
         for dep in override_summary.dependencies() {

tests/testsuite/overrides.rs

@@ -830,7 +830,7 @@ To change the dependency graph via an override it's recommended to use the
 `[replace]` feature of Cargo instead of the path override feature. This is
 documented online at the url below for more information.
 
-http://doc.crates.io/specifying-dependencies.html#overriding-dependencies
+https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#overriding-dependencies
 
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