DM-34531: Fix incorrect RangeField docstrings

[parejkoj]

I noticed this when adding a RangeField to meas_extensions_piff: the stated default for inclusiveMax in the docs didn't match the default value in the kwarg list, so I removed the redundant "(default)" lines.

[codecov]

Codecov Report

Merging #71 (f8d61d0) into main (2161031) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   83.68%   83.68%           
=======================================
  Files          40       40           
  Lines        2972     2972           
=======================================
  Hits         2487     2487           
  Misses        485      485           

Impacted Files	Coverage Δ
python/lsst/pex/config/rangeField.py	87.50% <ø> (ø)

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[parejkoj]

@timj : tiny review request here, since it's independent of the original ticket which might take a lot longer.

[timj]

I think removing the "default" is okay since Sphinx will report the defaults. (and yes, the one for inclusiveMax is actually documented with the wrong default).