fix: tolerate callback parameter values in ParameterRow (via #4873)

* fix: tolerate callback parameter values in ParameterRow
* Update 4867.js

test/e2e-cypress/static/documents/bugs/4867.yaml

@@ -0,0 +1,24 @@
+openapi: 3.0.1
+info:
+   title: test
+   version: "0.1"
+paths:
+  /test:
+    post:
+      operationId: myOp
+      responses:
+        default:
+          description: ok
+      callbacks:
+        subscription:
+          http://$request.query.url:
+            post:
+              description: myCallback
+              parameters:
+              - name: myParam
+                in: query
+                schema:
+                  type: string
+              responses:
+                default:
+                  description: ok

test/e2e-cypress/tests/bugs/4867.js

@@ -0,0 +1,17 @@
+describe("#4867: callback parameter rendering", () => {
+  it("should render parameters correctly", () => {
+    cy
+      .visit("/?url=/documents/bugs/4867.yaml")
+      .get("#operations-default-myOp")
+      .click()
+      .contains("Callbacks")
+      .click()
+
+      .get(".callbacks-container")
+      .contains("http://$request.query.url")
+      .click()
+
+      .get(".parameters-container")
+      .contains("myParam")
+  })
+})