Fix inccorect wiki link to printer

Update my_plugin tutorial

plugin_example/slither_my_plugin/detectors/example.py

@@ -12,8 +12,17 @@ class Example(AbstractDetector):
     IMPACT = DetectorClassification.HIGH
     CONFIDENCE = DetectorClassification.HIGH
 
-    def detect(self):
+    WIKI = ''
 
-        self.logger('Nothing to detect!')
+    WIKI_TITLE = ''
+    WIKI_DESCRIPTION = ''
+    WIKI_EXPLOIT_SCENARIO = ''
+    WIKI_RECOMMENDATION = ''
 
-        return []
+    def _detect(self):
+
+        info = 'This is an example!'
+
+        json = self.generate_json_result(info)
+
+        return [json]

slither/printers/summary/variables_order.py

@@ -10,7 +10,7 @@ class VariablesOrder(AbstractPrinter):
     ARGUMENT = 'variables-order'
     HELP = 'Print the storage order of the state variables'
 
-    WIKI = 'https://github.com/trailofbits/slither/wiki/Printer-documentation#variables-written-and-authorization'
+    WIKI = 'https://github.com/trailofbits/slither/wiki/Printer-documentation#variables-order'
 
     def output(self, _filename):
         """