Update Required for NWB Format Documentation to Reflect Latest Release (2.7)

[tabedzki]

I've noticed that the current documentation for the NWB Format Overview appears to be outdated. It references version 2.6.0-alpha, while the latest release is version 2.7, which was made available in February. This discrepancy might be limited to versioning details within the documentation, but it could potentially lead to confusion or misalignment with the latest features and specifications of the NWB format.

Could the documentation be reviewed and updated to accurately reflect the features and versioning of the 2.7 release?

Thank you in advance for your help