Render docs for methods by default

We should render docs for methods by default rather than requiring showdoc(...) on each method. Of course its better if people use showdoc(method) as that promotes better docs, but perhaps for people starting out it can help with initial setup?

未指定文件、测试或入口点。首先定位 showdoc(method) 的实现和测试，然后比较默认渲染与显式的 showdoc(...)。完成的标准是：方法文档无需 showdoc(...) 即可渲染，同时现有的显式用法仍受支持。

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