[Repo Assist] Add doc comment examples to key ExprXxxNode types in SyntaxOak.fs

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Adds short /// Example: ... doc comments to the most commonly encountered expression node types in SyntaxOak.fs, making it easier for new and existing contributors to quickly understand which F# syntax construct each node represents without having to search through the AST or use fantomas-tools by trial and error.

This is a first step toward the goal described in #2991.

Types documented

Node	Example syntax
ExprLazyNode	lazy computeExpensiveValue
ExprNewNode	new StringBuilder(capacity)
ExprTupleNode	(a, b, c)
ExprArrayOrListNode	[a; b; c] / `[
ExprRecordNode	{ Field1 = v1 } / { existing with Field1 = v }
ExprLambdaNode	fun x y -> x + y
ExprMatchLambdaNode	function | Some x -> x | None -> d
ExprMatchNode	match x with | Some v -> v | None -> 0
ExprSameInfixAppsNode	a + b + c (same operator repeated)
ExprInfixAppNode	a + b (two operands)
ExprChain	person.Address.City.ToUpper()
ExprAppLongIdentAndSingleParenArgNode	List.map(f)
ExprAppSingleParenArgNode	f(a)
ExprAppNode	List.map f xs
ExprIfThenNode	if condition then result
ExprIfThenElseNode	if condition then trueResult else falseResult
ExprIfThenElifNode	if a then x elif b then y else z

Test Status

Build succeeds (dotnet build src/Fantomas.Core/Fantomas.Core.fsproj -c Release). This is a documentation-only change with no behavioral impact.

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[github-actions]

Pull request created: #3216