Incorrect syntax for some instructions' "definedBy" extensions

[ThinkOpenly]

Some instructions' "definedBy" fields appear to be incorrect, using an open comma-separated list, rather than a subfield refinement with "allOf".

./arch/inst/F/fmaxm.s.yaml:definedBy: F, Zfa
./arch/inst/F/froundnx.s.yaml:definedBy: F, Zfa
./arch/inst/F/fround.s.yaml:definedBy: F, Zfa
./arch/inst/F/fltq.s.yaml:definedBy: F, Zfa
./arch/inst/F/fleq.s.yaml:definedBy: F, Zfa
./arch/inst/F/fli.s.yaml:definedBy: F, Zfa
./arch/inst/F/fminm.s.yaml:definedBy: F, Zfa

I think each of these should be expanded to:

definedBy:
  allOf:
  - F
  - Zfa

Although, since Unpriv spec Version 20240411 says:

The Zfa extension depends on the F extension

maybe only the Zfa extension needs to be called out as the "definedBy" extension?