Woops, it's go not rust

src/dev/golang/testing.md

@@ -100,4 +100,10 @@ if testing.Short() {
 
 ```shell
 go test github.com/go/pkg/package --short
-```
+```
+
+## Cleanup test cache
+
+```shell
+go clean -testcache
+```

src/dev/rust/testing.md

@@ -13,9 +13,3 @@ cargo test -- --nocapture
 ```shell
 cargo test -- --no-fail-fast
 ```
-
-## Cleanup test cache
-
-```shell
-go clean -testcache
-```