add {V} to the docstring, sort alias by ASCIIbetical order

Author: sean0921

pygmt/src/grdlandmask.py

@@ -19,8 +19,8 @@
     G="outgrid",
     I="spacing",
     R="region",
-    r="registration",
     V="verbose",
+    r="registration",
 )
 @kwargs_to_strings(R="sequence")
 def grdlandmask(**kwargs):
@@ -45,6 +45,7 @@ def grdlandmask(**kwargs):
         in.
     {I}
     {R}
+    {V}
     {r}
 
     Returns