Fix empty anchor tags in lang_variables and ha docs

htmlproofer flags <a> tags without href attributes. Replace legacy
named anchor patterns with <span id="..."></span> which is the
correct HTML5 approach for bookmark targets.

- lang_variables.markdown: 5 nested <a id="..."> tags
- ha.markdown: 1 <a name="..."> tag

Fixes 12 htmlproofer failures. Part of #120.

Signed-off-by: Michael Harp <mike@mikeharp.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: miharp

docs/_openvox_8x/lang_variables.markdown

@@ -17,7 +17,7 @@ title: "Language: Variables"
 [puppet.conf]: ./config_file_main.html
 
 
- <a id="facts"><a id="trusted-node-data"><a id="agent-set-variables"><a id="master-set-variables"><a id="parser-set-variables">
+<span id="facts"></span><span id="trusted-node-data"></span><span id="agent-set-variables"></span><span id="master-set-variables"></span><span id="parser-set-variables"></span>
 
 Variables store values so they can be accessed later.
 

docs/_openvoxdb_8x/ha.markdown

@@ -116,7 +116,7 @@ catalog vs. the many database rows required to store its resources). This
 facilitates simple, deterministic conflict resolution.
 
 
-Q: <a name="exportedResources"></a>*What's the deal with exported resources?*
+Q: <span id="exportedResources"></span>*What's the deal with exported resources?*
 
 A: Exported resources are a great feature, but you need to be careful when using
 them. In particular: because PuppetDB is *eventually* consistent, changes to