Update build.md with sample rebuild code

Added sample rebuild code for Docker image deployment.

Author: terrywbrady

present/tagging/build.md

@@ -167,7 +167,9 @@ Each rebuild will also create an "archive" tag.  A lifecycle policy will expire
   - `subservice:archive-${TAG_OR_BRANCH}-${BUILDDATE}`
 
 <details>
+  
 <summary> Sample Rebuild Code</summary>
+
 ```
       git fetch --all
       if [[ "$MODE" == "OnDemand" ]]
@@ -321,7 +323,9 @@ Each rebuild will also create an "archive" tag.  A lifecycle policy will expire
 
 
 <details>
+  
 <summary> Sample Rebuild Code</summary>
+
 ```
       git fetch --all
       # daily / on-demand rebuild of deployed images