Empty API References Page for v0.16.1 release for Google API {Spanner, Notebooks, Manufacturers}

[Kian-Meng Ang]

Steps to reproduce

1. Go https://hexdocs.pm/google_api_manufacturers/api-reference.html

2. Select the v0.16.0, https://hexdocs.pm/google_api_manufacturers/0.16.0/api-reference.html

3. API References Page is not empty.
   

4. Select v0.16.1, https://hexdocs.pm/google_api_manufacturers/api-reference.html

5. API References Page is empty.
   

Affected pages:

• https://hexdocs.pm/google_api_spanner/api-reference.html
• https://hexdocs.pm/google_api_notebooks/api-reference.html
• https://hexdocs.pm/google_api_manufacturers/api-reference.html

[Martin Nijboer]

Version 0.34.0 of the Cloud Storage library has an empty API reference page as well: https://hexdocs.pm/google_api_storage/0.34.0/api-reference.html