fix: label models section as Schemas in OpenAPI 3 (via #5065)

* fix: label models section `Schemas` in OpenAPI 3

* Update swos-63.js

test/e2e-cypress/tests/bugs/swos-63.js

@@ -0,0 +1,14 @@
+describe("SWOS-63: Schema/Model section labeling", () => {
+  it("should render `Schemas` for OpenAPI 3", () => {
+    cy
+      .visit("/?url=/documents/petstore-expanded.openapi.yaml")
+      .get("section.models > h4")
+      .contains("Schemas")
+  })
+  it("should render `Models` for OpenAPI 2", () => {
+    cy
+      .visit("/?url=/documents/petstore.swagger.yaml")
+      .get("section.models > h4")
+      .contains("Models")
+  })
+})