Fix submit docs startup string

app.py

@@ -1439,7 +1439,7 @@ This is the smallest legal record and a good shape for checking the schema:
 - Click **Verify** before submitting; the preview is rendered from the same canonical JSON that is archived.
 """
 
-SCHEMA_DOCS_MD = f"""### Canonical Fields
+SCHEMA_DOCS_MD = """### Canonical Fields
 
 Required top-level fields:
 
@@ -1459,6 +1459,7 @@ Supported shape specs:
 - `rectangle`: `width` and `height`
 
 The verifier rejects boundary protrusion and pair overlap above the selected tolerance.
+""" + f"""
 
 ### Four Circles In A Square