Improve Fig.show() comment

Author: seisman

pygmt/figure.py

@@ -273,8 +273,7 @@ def show(self, dpi=300, width=500, method=None):
         This is useful when running unit tests and building the documentation
         in consoles without a Graphical User Interface.
 
-        Note that the external viewer does not block the current process,
-        so this won't work if multiple figures are shown in one script.
+        Note that the external viewer does not block the current process.
 
         Parameters
         ----------