DOC: Fix default value for inplace argument in RasterArray.set_nodata

[apiwat-chantawibul]

• Closes DOC: Default value for inplace argument of RasterArray.set_nodata is inconsistent with its docstring. #508

Docstring for default value of inplace argument to RasterArray.set_nodata is changed to match actual implemented value (True).

[snowman2]

Thanks @apiwat-chantawibul 👍

[codecov]

Codecov Report

Merging #509 (21f2765) into master (64cc094) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #509   +/-   ##
=======================================
  Coverage   95.82%   95.82%           
=======================================
  Files          13       13           
  Lines        1581     1581           
=======================================
  Hits         1515     1515           
  Misses         66       66           

Impacted Files	Coverage Δ
rioxarray/raster_array.py	97.16% <ø> (ø)

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