terminology.rst: fix italics [skip-ci] (#6937)
terminology.rst: fix italics [skip-ci] (#6937)

- [x] Closes  #6932

@zmoon - obviously it would be nice if we had a linter for this but this is for another time.
jhamman/xarray,pydata/xarray,jhamman/xarray,pydata/xarray,jhamman/xarray,pydata/xarray