docs: Update repo location

Bug: 325472122
Change-Id: Ieeed5c9b5017008612ae4d32b28231683180839e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/200311
Pigweed-Auto-Submit: Ted Pudlik <tpudlik@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Kayce Basques <kayce@google.com>

README.md

diff --git a/README.md b/README.md
index 83ec369..7da4f53 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 ## Cloning
 
 ```
-git clone --recursive https://pigweed.googlesource.com/example/echo
+git clone --recursive https://pigweed.googlesource.com/pigweed/quickstart/bazel
 ```
 
 If you already cloned but forgot to include `--recursive`, run `git submodule