Remove newline concat in _build_option_description function

Author: jamescobonkerr

pandas/core/config.py

@@ -650,7 +650,6 @@ def _build_option_description(k):
         s += (u(', use `{rkey}` instead.')
               .format(rkey=d.rkey if d.rkey else ''))
         s += u(')')
-        s += '\n'
 
     return s