Update git submodules

* Update contributor-guide from branch 'master'
  - Merge "Add reference to `Comparison of Official Group Structures` document"
  - Add reference to `Comparison of Official Group Structures` document
    
    TC just published a reference document
    `Comparison of Official Group Structures`.
    
    Change-Id: I0a7ae25d11d54857986118337a94f6c69076b823
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Zuul 2020-01-22 13:16:41 +00:00 committed by Gerrit Code Review
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commit 5d5d9ff91d
1 changed files with 1 additions and 1 deletions

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Subproject commit be4ce98dcf3eabc7c8f71aebe353ba9993aa7e7a
Subproject commit 8efcb8dfb5bba7f091124ad13cbe4e9fcb3dc743