Fix issues with enums in NI-SCOPE documentation

[shilohbeeler-NI]

For a number of the newly added properties in the NI-SCOPE measurement library, enums which are referenced in the property documentation have strange results when run through the codegen replacement. For example, meas_fir_filter_window references the ArrayMeasurement enum mistakenly, and meas_percentage_method doesn't replace the default NISCOPE_* with correctly formatted enum references.

[sbethur]

Other notes from API review:

• Maybe the possible enums values shouldn't be listed in the documentation at all, just the name of the enums itself?
• Some issues with enum values having different names in the documentation vs. the actual enum code.