Only some attributes are pulled into the auto-generated api .yaml files

[cjsha]

This needs to fix so that I can categorize properties into "Configuration Property" or "Acquisition Property" categories.

For example:

• [Range(0, 1000000)] is pulled into syntax.content for BeatsPerSecond
• [Category(ConfigurationCategory)] & [Description(<whatever>)] are not pulled into syntax.content for either BeatsPerSecond or Enable

The relevant files for this example are: OpenEphys.Onix.ConfigureHeartbeart.yml (generated locally by docfx metadata command) and ConfigureHeartbeart.cs

[cjsha]

relevant issue in the docfx repo