Exclude signature files from twine upload (apache#1071)

Author: sungwy

mkdocs/docs/how-to-release.md

@@ -230,7 +230,9 @@ svn mv ${SVN_DEV_DIR_VERSIONED} ${SVN_RELEASE_DIR_VERSIONED} -m "PyIceberg: Add
 The latest version can be pushed to PyPi. Check out the Apache SVN and make sure to publish the right version with `twine`:
 
 ```bash
-twine upload /tmp/iceberg-dist-release/pyiceberg-<VERSION>/*
+svn checkout https://dist.apache.org/repos/dist/release/iceberg /tmp/iceberg-dist-release/
+cd /tmp/iceberg-dist-release/pyiceberg-${VERSION_WITHOUT_RC}
+twine upload pyiceberg-*.whl pyiceberg-*.tar.gz
 ```
 
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