AVRO-2849: Update spec to clarify valid namespaces (#917)

- Adds the grammar as discussed on the mailing list:
https://lists.apache.org/thread.html/r93c4142922587ceefab78d2695570778b22a51e4bd140fd58c21984b%40%3Cdev.avro.apache.org%3E

- Removes double "the".
1 file changed
tree: a31bacefb957566cbd908f8524820418ea6f2510
  1. .github/
  2. .travis/
  3. doc/
  4. lang/
  5. share/
  6. .asf.yaml
  7. .editorconfig
  8. .gitignore
  9. .travis.yml
  10. .yamllint.yml
  11. BUILD.md
  12. build.sh
  13. composer.json
  14. DIST_README.txt
  15. LICENSE.txt
  16. NOTICE.txt
  17. pom.xml
  18. README.md
README.md

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