Publishing page: Add tip for failing docker-compose up command

Replace the previously introduced tab character with a blank line. Do so
while reusing that same line for this change.

Helped-by: David Pursehouse <dpursehouse@collab.net>
Change-Id: I2870aaf376856399682c1eb3e09eb50e101f7b63
diff --git a/pages/site/publishing-gerrit-docs.md b/pages/site/publishing-gerrit-docs.md
index 7b590be..9cbe2f4 100644
--- a/pages/site/publishing-gerrit-docs.md
+++ b/pages/site/publishing-gerrit-docs.md
@@ -43,10 +43,17 @@
 
 1.  Navigate to the root of the homepage repository.
 1.  Type the following command:
-    
+
     ```
     docker-compose up
     ```
+1.  If that command fails, try these, with caution:
+
+    ```
+    docker-compose down && \
+    git clean -fdx && \
+    docker-compose up
+    ```
 
 The docker file is configured to build the site and serve it on a local staging
 server. To access the staging server, navigate to the following URL in your