What is the purpose of this change?

In azureblob and azurefile, the documentation misspelled the tenant setting to tenant_id.
This is a documentation only change.

Was the change discussed in an issue or in the forum before?

no

Checklist

• I have read the contribution guidelines.
• I have added tests for all changes in this PR if appropriate.
• I have added documentation for the changes if appropriate.
• All commit messages are in house style.
• I'm done, this Pull Request is ready for review :-)