Use the name platform-independent

Author: kwankyu

build/bin/sage-spkg

@@ -453,7 +453,8 @@ cd "$PKG_NAME" || exit $?
 
 case "$PKG_SRC" in
     *.whl)
-        # (Non-platform) wheel. Do not extract, do not create a src directory,
+        # (Platform-independent) wheel
+        # Do not extract, do not create a src directory,
         # just copy to dist/ and create a simple install script.
         mkdir -p dist
         cp "$PKG_SRC" dist/

src/doc/en/developer/packaging.rst

@@ -87,8 +87,8 @@ the following source types:
    - comes from the wheel file named in the required file ``checksums.ini``
      and hosted on the Sage mirrors;
 
-   - per policy, only non-platform wheels are allowed, i.e., ``*-none-any.whl``
-     files;
+   - per policy, only platform-independent wheels are allowed, i.e.,
+     ``*-none-any.whl`` files;
 
    - its version number is defined by the required file ``package-version.txt``;
 
@@ -1214,7 +1214,7 @@ must meet the following requirements:
 - **Build Support**. The code must build on all the fully supported
   platforms (Linux, macOS, Cygwin); see :ref:`chapter-portability_testing`.
   It must be installed either from source as a normal package,
-  or as a Python (non-platform) wheel package, see
+  or as a Python (platform-independent) wheel package, see
   :ref:`section-package-source-types`.
 
 - **Quality**. The code should be "better" than any other available