Update pvlib/irradiance.py

Co-authored-by: Echedey Luis <80125792+echedey-ls@users.noreply.github.com>

Author: Omesh37

pvlib/irradiance.py

@@ -1964,7 +1964,7 @@ def dirint(ghi, solar_zenith, times, pressure=101325., use_delta_kt_prime=True,
 
     Returns
     -------
-    dni : numeric or pd.Series
+    dni : numeric
         Estimated direct normal irradiance. Returns float if all inputs
         are scalar, pd.Series otherwise. [Wm⁻²]