docs: Clarify TypeScriptVersion accepts any decimal ≥ 4.3

[Copilot]

TypeScriptVersion had an ambiguous doc comment that implied it might only accept specific predefined values, leading users to believe they couldn't pass their actual TypeScript version (e.g. 4.9).

Changes

• TypeScriptGeneratorSettings.TypeScriptVersion: Updated XML doc comment to explicitly state the property accepts any decimal value ≥ 4.3 and explains that the value gates which TypeScript language features are emitted in generated code.

// Before (ambiguous)
/// <summary>Gets or sets the target TypeScript version (minimum, default: 4.3).</summary>

// After (clear)
/// <summary>Gets or sets the target TypeScript version (default: 4.3, minimum: 4.3).
/// Accepts any decimal version number greater than or equal to 4.3 (e.g. 4.3, 4.9, 5.0).
/// The version is used to determine which TypeScript language features are available and may be used in the generated code.</summary>

Original prompt

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This section details on the original issue you should resolve

<issue_title>Documentation: TypeScriptGeneratorSettings is unclear about which typeScriptVersion is selected</issue_title>
<issue_description>My understanding is that there's only some specific typescript version that nswag supports for typeScriptVersion. However, https://github.com/RicoSuter/NJsonSchema/wiki/TypeScriptGeneratorSettings does not clearly specify which versions are valid, or how (if at all) it fallbacks to a supported version given a different version passed in.

For context: I wanted to have my nswag script automatically follow my project's current version of typescript as closely as possible.
</issue_description>

Comments on the Issue (you are @copilot in this section)

@RicoSuter Latest version of nswag/njs requires minimum of 4.3… (docs updated)

Im not even sure whether there are features which requires higher version.

But you can set it to your number and gens will react..

Though the nswagstudio uses a select a the moment with only 4.3, we should change that to be a number input</comment_new>
<comment_new>@RicoSuter

If I understand your answer correctly, I should be able to do just that (ie: if I use TS 4.9.5, I can pass in typeScriptVersion:4.9 and it's only used to see if certain features are available for TS 4.9)

Yeah i think everywhere except in studio its a decimal and this should just work</comment_new>

• Fixes Documentation: TypeScriptGeneratorSettings is unclear about which typeScriptVersion is selected #1859

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