fix docstrings in irf/io.py
@@ -81,7 +81,15 @@ def load_cta_irfs(filename):
>>> from gammapy.irf import load_cta_irfs
>>> cta_irf = load_cta_irfs("$GAMMAPY_DATA/cta-1dc/caldb/data/cta/1dc/bcf/South_z20_50h/irf_file.fits")
>>> print(cta_irf['aeff'])
-
+ EffectiveAreaTable2D
+ --------------------
+ <BLANKLINE>
+ axes : ['energy_true', 'offset']
+ shape : (42, 6)
+ ndim : 2
+ unit : m2
+ dtype : >f4
+ <BLANKLINE>
"""
from .background import Background3D
from .effective_area import EffectiveAreaTable2D
