SPDX: Documentation fixups

Documentation/Doxygen/ModuleSystem.md

@@ -1035,22 +1035,3 @@ but it is not needed yet.
   tags is not supported.
 
 * Only comments starting with `//` are considered.
-
-* Related to arguments `SPDX_LICENSE_IDENTIFIER` and `SPDX_COPYRIGHT_TEXT` of
-  {ref}`vtk.module <module-parse-module>`
-
-  * Arguments should be unquoted.
-
-    **Bad**
-
-    ```text
-    SPDX_COPYRIGHT_TEXT
-      "Awesome contributor"
-    ```
-
-    **Good**
-
-    ```text
-    SPDX_COPYRIGHT_TEXT
-      Awesome contributor
-    ```

Documentation/docs/advanced/spdx_and_sbom.md

@@ -55,9 +55,9 @@ In the third party `CMakeLists.txt`, make sure to specify, in the `vtk_module_th
 ```
  vtk_module_third_party(
     SPDX_LICENSE_IDENTIFIER
-      BSD-3-CLAUSE
+      "BSD-3-CLAUSE"
     SPDX_COPYRIGHT_TEXT
-      Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
+      "Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen"
     SPDX_DOWNLOAD_LOCATION
       https://gitlab.kitware.com/vtk/vtk
     [...]

IO/PLY/vtk.module

@@ -4,6 +4,10 @@ LIBRARY_NAME
   vtkIOPLY
 LICENSE_FILES
   Copyright.txt
+SPDX_LICENSE_IDENTIFIER
+  MIT
+SPDX_COPYRIGHT_TEXT
+  Copyright © (c) Ken Martin, Will Schroeder, Bill Lorensen
 KIT
   VTK::IO
 GROUPS

ThirdParty/loguru/CMakeLists.txt

 vtk_module_third_party_internal(
     LICENSE_FILES "vtkloguru/LICENSE"
+    SPDX_LICENSE_IDENTIFIER "MIT AND BSD"
+    SPDX_COPYRIGHT_TEXT "Copyright © (c) Ken Martin, Will Schroeder, Bill Lorensen"
     VERSION       "2.1"
     STANDARD_INCLUDE_DIRS)