Fix trailing whitespace

Author: willschlitzer

pygmt/helpers/decorators.py

@@ -44,11 +44,11 @@
     "W": """pen : str
     Set pen attributes for lines or the outline of symbols.""",
     "XY": r"""xshift : str
-    [**a**\|\ **c**\|\ **f**\|\ **r**\][*xshift*]. 
+    [**a**\|\ **c**\|\ **f**\|\ **r**\][*xshift*].
     Shift plot origin in x-direction.
 
     yshift : str
-    [**a**\|\ **c**\|\ **f**\|\ **r**\][*yshift*]. 
+    [**a**\|\ **c**\|\ **f**\|\ **r**\][*yshift*].
     Shift plot origin in y-direction. Full documentation is at
     :gmt-docs:`gmt.html#xy-full`.""",
     "j": r"""distcalc : str