[docs] Update Taiwan country name in demos

[chiahao]

Closes #39728

• I have followed (at least) the PR section of the contributing guide.

[mui-bot]

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[chiahao]

Fix Taiwan country name.

[mj12albert]

@chiahao This column should refer to the name of the language though and not the country, so Chinese (Taiwan) should be accurate?

e.g. https://developers.google.com/admin-sdk/directory/v1/languages

[chiahao]

I'm so sorry to bother you. Yes, you are right.

[chiahao]

@mj12albert Do I have to revert this file?

[mj12albert]

I've done it ~

[mj12albert]

Thanks for working on this 👍 @chiahao

[oliviertassinari]

To link back the history. We did a change around this in #34611

[oliviertassinari]

It looks like it's a sensitive topic lukes/ISO-3166-Countries-with-Regional-Codes#43.

ChatGTP answer to "What label should a country picker use for Taiwan?" is interesting.

The labeling of Taiwan can be a sensitive and politically charged issue due to the complex geopolitical situation involving Taiwan, China, and other countries. Different entities and organizations may use different labels based on their stance on the matter.

Some commonly used labels for Taiwan include:

- Taiwan: Some countries and organizations, especially those that maintain diplomatic relations with Taiwan or adopt a more neutral stance, use "Taiwan" as the label.

- Taiwan, Province of China: This label is often used in contexts where there is a recognition of the "One-China" policy, which asserts that there is only one China, and Taiwan is a part of it. This is the terminology commonly used by the United Nations and some international organizations.

- Chinese Taipei: In certain international events, Taiwan participates under the name "Chinese Taipei" to comply with the "One-China" policy without explicitly using the name Taiwan.

It's important to note that the choice of label can have diplomatic implications, and it's recommended to be aware of the political sensitivities involved. When implementing a country picker, it's advisable to use a label that aligns with the prevailing international standards and norms or to provide options that allow users to choose from different labels based on their preferences or perspectives.

From the historical perspective, https://en.wikipedia.org/wiki/History_of_Taiwan Taiwan seems to make more sense (in the doubt have people living there decide), however, from the perspective of we want to better tailor the library to meet where the Chinese community is at, Taiwan, Province of China would make more sense.

No strong preferences, I feel that the previous previous terminology was closer to the reality, so clearer, and more balanced "Taiwan, Republic of China" (a country within a larger country).