Hidden features are documented in PySystemCoupling API documentation

### 🔍 Before submitting the issue

- [X] I have searched among the existing issues
- [X] I am using a Python virtual environment

### 🐞 Description of the bug

All hidden features are documented in PySystemCoupling API Reference. For example, here:

https://systemcoupling.docs.pyansys.com/version/0.4/api/core/settings/_autosummary/api/analysis_control.html#analysis-control

Options like `unmapped_value_options` are hidden behind an alpha flag and should be omitted from the documentation.

### 📝 Steps to reproduce

Open this page and see hidden features being documented:

https://systemcoupling.docs.pyansys.com/version/0.3/api/core/settings/_autosummary/api/unmapped_value_options.html

### 💻 Which operating system are you using?

Windows

### 📀 Which ANSYS version are you using?

24.1

### 🐍 Which Python version are you using?

3.10

### 📦 Installed packages

```shell
n/a
```

Start with the linked API Reference pages for analysis_control and unmapped_value_options, then trace those pages to the documentation source or configuration that exposes alpha-flagged members. Done means hidden features such as unmapped_value_options no longer appear in the generated PySystemCoupling API documentation.

Written by the indexing model from the issue text.