[readme] Avoid src/...

It seems to be broken at the moment.

Change-Id: I831f5efac3e99834c84db487bec3591073c8df6f
Reviewed-on: https://fuchsia-review.googlesource.com/c/sdk-samples/drivers/+/693522
Reviewed-by: Suraj Malhotra <surajmalhotra@google.com>
Commit-Queue: Simon Shields <simonshields@google.com>
diff --git a/README.md b/README.md
index 1242be5..64aa568 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@
    > described in https://fuchsia.googlesource.com/sdk-integration/+/0503b02c059a6de76242280b467898358ba30ae3
 
    ```
-   bazel build --config=fuchsia_x64 src/...
+   bazel build --config=fuchsia_x64 src:samples_repository
    ```
 
    This command will build and package all the samples.