fix broken link (dotnet#10562)

docs/compiler-guide.md

@@ -80,7 +80,7 @@ The following are the key phases and high-level logical operations of the F# com
 
 * _Sequentially type checking files_, see [CheckDeclarations.fsi](https://github.com/dotnet/fsharp/blob/master/src/fsharp/CheckDeclarations.fsi)/[CheckDeclarations.fs](https://github.com/dotnet/fsharp/blob/master/src/fsharp/CheckDeclarations.fs). Accepts an AST plus a type checking context/state and produces new Typed Tree nodes
   incorporated into an updated type checking state, plus additional Typed Tree Expression nodes used during code generation.  A key part of this is
-  checking syntactic types and expressions, see [CheckExpressions.fsi](https://github.com/dotnet/fsharp/blob/master/src/fsharp/CheckDeclarations.fsi)/[CheckExpressions.fs](https://github.com/dotnet/fsharp/blob/master/src/fsharp/TypeCCheckDeclshecker.fs) including the state held across the checking of a file (see `TcFileState`) and the
+  checking syntactic types and expressions, see [CheckExpressions.fsi](https://github.com/dotnet/fsharp/blob/master/src/fsharp/CheckDeclarations.fsi)/[CheckExpressions.fs](https://github.com/dotnet/fsharp/blob/master/src/fsharp/CheckDeclarations.fs) including the state held across the checking of a file (see `TcFileState`) and the
   environment active as we traverse declarations and expressions (see `TcEnv`).
 
 * _Pattern match compilation_, see [PatternMatchCompilation.fsi](https://github.com/dotnet/fsharp/blob/master/src/fsharp/PatternMatchCompilation.fsi)/[PatternMatchCompilation.fs](https://github.com/dotnet/fsharp/blob/master/src/fsharp/PatternMatchCompilation.fs). Accepts a subset of checked Typed Tree nodes representing F# pattern matching and produces Typed Tree expressions implementing the pattern matching. Called during type checking as each construct involving pattern matching is processed.