Update pvlib/atmosphere.py

Co-authored-by: Kevin Anderson <[email protected]>

Author: kurt-rhee

pvlib/atmosphere.py

@@ -347,8 +347,9 @@ def rh_from_tdew(temperature, dewpoint, coeff=(6.112, 17.62, 243.12)):
         Air temperature (dry-bulb temperature) in degrees Celsius
     dewpoint : numeric
         Dew-point temperature in degrees Celsius
-    coeff: tuple
-        Magnus equation coefficient (A, B, C)
+    coeff : tuple, default (6.112, 17.62, 243.12)
+        Magnus equation coefficients (A, B, C).  The default values are those
+        recommended by the WMO [1]_.
 
     Returns
     -------