Remove unused function and argument

I removed the unused function and (function)argument in code

Change-Id: Ib7afa5d868c3c7769f53e45c270850e4c3370f86

watcher/doc.py

@@ -47,7 +47,7 @@ class WatcherTerm(rst.Directive):
     # You need to put an import path as an argument for this directive to work
     required_arguments = 1
 
-    def add_textblock(self, textblock, *lineno):
+    def add_textblock(self, textblock):
         for line in textblock.splitlines():
             self.add_line(line)