Fix examples.md template: escape comment markers

[basnijholt]

Summary

• Escape HTML comment markers (<!-- and -->) in the regex pattern to prevent markdown parsers from breaking
• Remove orphaned content that was duplicated outside OUTPUT blocks
• Clean up the template structure

Problem

The regex pattern in the CODE block contained literal <!-- SECTION:github-actions:START -->.*?<!-- SECTION:github-actions:END --> which has nested <!-- and --> inside the markdown comment. This caused the markdown renderer to interpret the first --> as ending the comment, making the rest of the pattern appear as visible text on the docs site.

Solution

Break up the string using concatenation so --> doesn't appear literally:

start_marker = "<!-" + "- SECTION:github-actions:START -" + "->"
end_marker = "<!-" + "- SECTION:github-actions:END -" + "->"
pattern = start_marker + ".*?" + end_marker

Test plan

• Verified docs_gen.py --verify passes
• Verified docs_gen.py --docs-only generates correct output