Fix the links to moved file of portable PDB docs (#46577)

Author: BartoszKlonowski

docs/csharp/language-reference/compiler-options/code-generation.md

@@ -36,10 +36,10 @@ The following values are valid:
 
 | Value      | Meaning                                                                                                 |
 |------------|---------------------------------------------------------------------------------------------------------|
-| `full`     | Emit debugging information to _.pdb_ file using default format for the current platform:<br>**Windows**: A Windows pdb file. <br>**Linux/macOS**: A [Portable PDB](https://github.com/dotnet/core/blob/main/Documentation/diagnostics/portable_pdb.md) file. |
+| `full`     | Emit debugging information to _.pdb_ file using default format for the current platform:<br>**Windows**: A Windows pdb file. <br>**Linux/macOS**: A [Portable PDB](https://github.com/dotnet/designs/blob/main/accepted/2020/diagnostics/portable-pdb.md) file. |
 | `pdbonly`  | Same as `full`. See the note below for more information. |
-| `portable` | Emit debugging information to .pdb file using cross-platform [Portable PDB](https://github.com/dotnet/core/blob/main/Documentation/diagnostics/portable_pdb.md) format. |
-| `embedded` | Emit debugging information into the _.dll/.exe_ itself (_.pdb_ file is not produced) using [Portable PDB](https://github.com/dotnet/core/blob/main/Documentation/diagnostics/portable_pdb.md) format. |
+| `portable` | Emit debugging information to .pdb file using cross-platform [Portable PDB](https://github.com/dotnet/designs/blob/main/accepted/2020/diagnostics/portable-pdb.md) format. |
+| `embedded` | Emit debugging information into the _.dll/.exe_ itself (_.pdb_ file is not produced) using [Portable PDB](https://github.com/dotnet/designs/blob/main/accepted/2020/diagnostics/portable-pdb.md) format. |
 
 > [!IMPORTANT]
 > The following information applies only to compilers older than C# 6.0.