api(dotnet): remove serializer options (#6641)

docs/src/api/csharp.md

@@ -7,12 +7,6 @@ Returns parsed request's body for `form-urlencoded` and JSON as a fallback if an
 When the response is `application/x-www-form-urlencoded` then a key/value object of the values will be returned.
 Otherwise it will be parsed as JSON.
 
-### param: Request.PostDataJSON.serializerOptions
-* langs: csharp
-- `documentOptions` <[null]|[JsonDocumentOptions]>
-
-Optional Json options that control custom behaviour when parsing the JSON.
-
 ### param: ElementHandle.selectOption.values = %%-csharp-select-options-values-%%
 ### param: ElementHandle.setInputFiles.files = %%-csharp-input-files-%%
 

utils/doclint/generateDotnetApi.js

@@ -468,6 +468,7 @@ function renderMethod(member, parent, name, out) {
   if (member.args.size == 0
     && type !== 'void'
     && !name.startsWith('Get')
+    && !name.startsWith('PostDataJSON')
     && !name.startsWith('As')) {
     if (!member.async) {
       if (member.spec)