docs: queries return MultiPolygons whole

[FarisHrvat]

Fixes #1255

Documents that bounding_box_query and polygon_query without clip return shapes whole, including MultiPolygon components entirely outside the query region, and points to polygon_query(clip=True) with shapely.box(...) for cutting them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.40%. Comparing base (ea93a37) to head (546220c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1265   +/-   ##
=======================================
  Coverage   91.40%   91.40%           
=======================================
  Files          53       53           
  Lines        8381     8381           
=======================================
  Hits         7661     7661           
  Misses        720      720           

Files with missing lines	Coverage Δ
src/spatialdata/_core/query/spatial_query.py	95.01% <ø> (ø)

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