[x/blog] README.md: fix link

Change-Id: If95523697fe41cd0856abb156c6aeb6cd1f52ddf
Reviewed-on: https://go-review.googlesource.com/c/blog/+/322749
Trust: Russ Cox <[email protected]>
Run-TryBot: Russ Cox <[email protected]>
Reviewed-by: Russ Cox <[email protected]>
X-Blog-Commit: da446da101b2109b6e2620b626056f86e6dbc490

Author: rsc

blog/README.md

@@ -51,7 +51,7 @@ Cloud Console for the golang-org project.
 Then:
 
 1. Visit the
-   [builds list](https://console.cloud.google.com/cloud-build/builds?project=golang-org&query=trigger_id%3D%22c99674d3-32c1-4aec-ade4-ae2d5a844369%22.)
+   [builds list](https://console.cloud.google.com/cloud-build/builds?project=golang-org&query=trigger_id%3D%22c99674d3-32c1-4aec-ade4-ae2d5a844369%22)
    and click on the build hash for the most recent build
    with trigger name “Redeploy-blog-on-blog-commit”.