Corrected Huawei FunctionStage to Huawei FunctionGraph in the serverless hosted platform

[Zhiyue-Wang]

please change Huawei FunctionStage to Huawei FunctionGraph. Refer to the official information https://www.huaweicloud.com/intl/en-us/product/functiongraph.html

[abhijeetgauravm]

hey @Zhiyue-Wang can u elaborate more where we are suppose to make these changes?

[tegioz]

Hi @Zhiyue-Wang 👋

Could you please open a PR with the suggested changes for that entry?

Thanks!