Update pvlib/atmosphere.py

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

Author: kurt-rhee

pvlib/atmosphere.py

@@ -358,14 +358,9 @@ def rh_from_tdew(temperature, dewpoint, coeff=(6.112, 17.62, 243.12)):
 
     References
     ----------
-    .. [1] (
-        https://library.wmo.int/viewer/68695/
-        ?offset=3#page=220&viewer=picture&o=bookmark&n=0&q=
-        )
-    .. [2] (
-        https://www.schweizerbart.de//papers/metz/detail/3/89544/
-        Advancements_in_the_field_of_hygrometry?af=crossref
-        )
+    .. [1] "Guide to Instruments and Methods of Observation",
+       World Meteorological Organization, WMO-No. 8, 2023.
+       https://library.wmo.int/idurl/4/68695
     """
 
     # Calculate vapor pressure (e) and saturation vapor pressure (es)