fix missing defaults in tsconfig documentation

[dynst]

https://www.typescriptlang.org/tsconfig/noEmitOnError.html
https://www.typescriptlang.org/tsconfig/allowUnusedLabels.html
https://www.typescriptlang.org/tsconfig/forceConsistentCasingInFileNames.html
https://www.typescriptlang.org/docs/handbook/compiler-options.html

noEmitOnError was added in TS 1.4 but doesn't currently have a documented default; in fact most boolean options don't, because they mostly default to false which doesn't show up.

The only options with a documented default of simply false (instead of a conditional) are special cased:

TypeScript-Website/packages/tsconfig-reference/scripts/tsconfig/generateJSON.ts

Lines 79 to 93 in c95f3eb

	// We don't get structured data for all compiler flags (especially ones which aren't in 'compilerOptions')
	// so, create these manually.
	const topLevelTSConfigOptions: CompilerOptionJSON[] = [
	{
	name: "files",
	type: "list",
	categoryCode: 0,
	// @ts-ignore
	description: {
	message: "Print names of files part of the compilation.",
	},
	defaultValue: "false",
	hostObj: "top_level",
	},

The defaultValue is statically typed to be a string here (inaccurately):

TypeScript-Website/packages/tsconfig-reference/scripts/cli/generateJSON.ts

Line 43 in c95f3eb

defaultValue?: string;

TypeScript-Website/packages/tsconfig-reference/scripts/tsconfig/generateJSON.ts

Line 51 in c95f3eb

defaultValue?: string;

But many non-boolean options are also still missing the defaultValue field, though, even if sometimes their default is documented in their description.

https://www.typescriptlang.org/tsconfig/#watch-excludeDirectories

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