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Merge #4232

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4232: Update Roslyn link in syntax.md r=matklad a=osa1

Eric Lippert has a new blog that he keeps updating, update the link to that

Co-authored-by: Ömer Sinan Ağacan <omeragacan@gmail.com>
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@ -35,7 +35,7 @@ The syntax tree consists of three layers:
* AST
Of these, only GreenNodes store the actual data, the other two layers are (non-trivial) views into green tree.
Red-green terminology comes from Roslyn ([link](https://docs.microsoft.com/en-ie/archive/blogs/ericlippert/persistence-facades-and-roslyns-red-green-trees)) and gives the name to the `rowan` library. Green and syntax nodes are defined in rowan, ast is defined in rust-analyzer.
Red-green terminology comes from Roslyn ([link](https://ericlippert.com/2012/06/08/red-green-trees/)) and gives the name to the `rowan` library. Green and syntax nodes are defined in rowan, ast is defined in rust-analyzer.
Syntax trees are a semi-transient data structure.
In general, frontend does not keep syntax trees for all files in memory.