Use version tag, not SHA, in OpenBolt generated note

OpenBolt's 'generated from' note showed the resolved commit SHA while
OpenVox and OpenFact show the clean version tag. Pass
PuppetReferences.version_commit (the pinned tag) to generated_note
instead of @commit (the SHA from Repo#checkout), matching the other
collections.

Closes #336

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Michael Harp <mike@mikeharp.com>

Author: miharp

lib/puppet_references/openbolt/docs.rb

@@ -59,7 +59,7 @@ def copy_reference_pages
       # leading H1 (the placement make_header uses for the other collections).
       # Falls back to after the YAML front matter, then to the top of the file.
       def insert_generated_note(content)
-        note = PuppetReferences::Util.generated_note('OpenBolt', @commit)
+        note = PuppetReferences::Util.generated_note('OpenBolt', PuppetReferences.version_commit)
         if (m = content.match(/\A(---\n.*?\n---\n\n)?(# [^\n]*\n)/m))
           "#{m[1]}#{m[2]}\n#{note}\n#{m.post_match}"
         elsif (m = content.match(/\A(---\n.*?\n---\n)/m))