fix(docs-gen): escape {{ in generated API markdown prose

docfx preserves verbatim spec-marker text from XML doc comments like

    "{{term(data set)}} of the number of {{termplural(Asset)}} ..."

in the generated `*.md` files. VitePress's underlying Vue template
compiler then treats `{{ ... }}` as a mustache interpolation and
tries to parse the contents as a JavaScript expression. Spec markers
contain unquoted spaces and operator-like tokens, so the parse fails
and the Docs-site CI's Build VitePress site job aborts with errors
like `Error parsing JavaScript expression: Unexpected token`.

Extend the post-processing awk pass to rewrite every `{{` outside
fenced code blocks as `{{`. The html-entity form survives
the markdown -> HTML pipeline and presents the original characters
to readers without engaging Vue's mustache parser. Standalone `}}`
is harmless once its opening `{{` is gone, so it is left alone.

Author: ottobolyos

docs/scripts/generate-api-ref.sh

@@ -182,13 +182,22 @@ while IFS= read -r -d '' md_file; do
     /^```/ { in_fence = !in_fence; print; next }
     in_fence { print; next }
     {
-      # Replace `<X` (uppercase) with `&lt;X` by walking each match.
+      # Replace `<X` (uppercase) or `<[` with `&lt;X` / `&lt;[` by
+      # walking each match.
       out = ""; s = $0
       while (match(s, /<([A-Z]|\[)/)) {
         out = out substr(s, 1, RSTART - 1) "&lt;" substr(s, RSTART + 1, RLENGTH - 1)
         s = substr(s, RSTART + RLENGTH)
       }
-      print out s
+      line = out s
+      # Replace `{{` with `&#123;&#123;` so Vue does not treat the
+      # token as a mustache interpolation. docfx preserves verbatim
+      # spec-marker text like `{{term(data set)}}` from XML doc
+      # comments, which Vue would otherwise try to parse as the
+      # JavaScript expression `term(data set)` and reject. The
+      # html-entity form survives the markdown -> HTML pipeline.
+      gsub(/\{\{/, "\\&#123;\\&#123;", line)
+      print line
     }
   ' "${md_file}" > "${md_file}.tmp" && mv "${md_file}.tmp" "${md_file}"
 done < <(find docs/api -name '*.md' -not -name 'index.md' -print0)