Updated docstrings for output_projection and shape_out to indicate that any APE-14 WCS is acceptable

[astrofrog]

Fixes #406

cc @DanRyanIrish

[DanRyanIrish]

Thanks for fixing this so quickly!

[codecov]

Codecov Report

Merging #407 (123c919) into main (44ac42e) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #407   +/-   ##
=======================================
  Coverage   93.62%   93.62%           
=======================================
  Files          25       25           
  Lines         894      894           
=======================================
  Hits          837      837           
  Misses         57       57           

Files	Coverage Δ
reproject/adaptive/high_level.py	100.00% <ø> (ø)
reproject/interpolation/high_level.py	100.00% <ø> (ø)
reproject/mosaicking/coadd.py	91.75% <ø> (ø)
reproject/spherical_intersect/high_level.py	100.00% <ø> (ø)

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