test: regenerate groundtruth for omml_multi_equation_paragraph

Re-run document conversion with current code to update .itxt and .json
groundtruth files. The .itxt had stale structure from the previous
programmatic fixture; the new real-document conversion produces the
correct output with three separate formula items.

Signed-off-by: giulio-leone <giulio97.leone@gmail.com>

Author: giulio-leone

tests/data/groundtruth/docling_v2/omml_multi_equation_paragraph.docx.itxt

@@ -1,13 +1,7 @@
-Issue 3: Concatenated equation blocks
-
-The paragraph below contains three separate <m:oMath> elements.
-Expected: three separate $$ blocks ($$a = b$$, $$c = d$$, $$e = f$$)
-Docling produces: one $$ block with all equations concatenated.
-
-All three <m:oMath> elements are siblings inside a single <w:p>.
-
-$$a=b$$
-
-$$c=d$$
-
-$$e=f$$
+item-0 at level 0: unspecified: group _root_
+  item-1 at level 1: section: group header-0
+    item-2 at level 2: section_header: Issue 3: Concatenated equation blocks
+      item-3 at level 3: text: The paragraph below contains thr ... ts are siblings inside a single <w:p>.
+      item-4 at level 3: formula: a=b
+      item-5 at level 3: formula: c=d
+      item-6 at level 3: formula: e=f

tests/data/groundtruth/docling_v2/omml_multi_equation_paragraph.docx.json

@@ -1,6 +1,6 @@
 {
   "schema_name": "DoclingDocument",
-  "version": "1.10.0",
+  "version": "1.9.0",
   "name": "omml_multi_equation_paragraph",
   "origin": {
     "mimetype": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",