Merge pull request #826 from neutrinoceros/numpy2_doctests

DOC: adapt a docstest for numpy 2 (representation of scalars changed)

docs/ccddata.rst

@@ -182,7 +182,7 @@ is between two `~astropy.nddata.CCDData` objects.
 
     >>> result = ccd.multiply(0.2 * u.adu)
     >>> uncertainty_ratio = result.uncertainty.array[0, 0]/ccd.uncertainty.array[0, 0]
-    >>> round(uncertainty_ratio, 5)   # doctest: +FLOAT_CMP
+    >>> float(round(uncertainty_ratio, 5))   # doctest: +FLOAT_CMP
     0.2
     >>> result.unit
     Unit("adu electron")