Add content for bug bash tomorrow (#203)

Author: bmorelli25

docs/source/contribute/index.md

@@ -11,6 +11,7 @@ Whether you're a technical writer or you've only edited Elastic docs once or twi
 
 * Simple bugs and enhancements --> [Contribute on the web](on-the-web.md)
 * Complex or multi-page updates --> [Contribute locally](locally.md)
+* Test migrated content --> [Migration guide](../migration/guide/index.md)
 
 ## Report a bug
 

docs/source/migration/guide/index.md

@@ -8,4 +8,52 @@ How to migrate content from Asciidoc to V3.
 
 Use the [adoc-to-md](https://github.com/elastic/adoc-to-md) conversion tool to migrate content sets from Asciidoc syntax to docs-builder syntax. Instructions to use the tool are in the readme file.
 
-After running the migration tool, you can move, and manipulate files while viewing a live preview of the content with docs-builder.
+After running the migration tool, you can move and manipulate files while viewing a live preview of the content with docs-builder.
+
+## Building migrated content sets for the bug bash
+
+Assuming the following directory structure:
+
+```markdown
+{GitHub_Repo_Dir}/
+├── tools/
+│   ├── docs-builder-mac-arm64.zip
+│   └── docs-builder
+├── elasticsearch.md
+├── observability-docs.md
+└── kibana.md
+```
+
+You can build migrated content sets on a Mac by running the following commands.
+
+```{tip}
+For other systems, see [Contribute locally](../../contribute/locally.md)
+```
+
+```bash
+# move to GitHub dir
+cd {GitHub_Repo_Dir}
+
+# clone req'd repos
+git clone https://github.com/elastic/elasticsearch.md.git
+git clone https://github.com/elastic/observability-docs.md.git
+git clone https://github.com/elastic/kibana.md.git
+
+# move back to GitHub dir
+cd {GitHub_Repo_Dir}
+mkdir tools
+cd tools
+
+# mac-specific
+curl -LO https://github.com/elastic/docs-builder/releases/latest/download/docs-builder-mac-arm64.zip
+unzip docs-builder-mac-arm64.zip
+
+# Build ES Guide
+./docs-builder serve -p ../elasticsearch.md/docs
+
+# Build Obs Guide
+./docs-builder serve -p ../observability-docs.md/docs
+
+# Build Kib Guide
+./docs-builder serve -p ../kibana.md/docs
+```