chore: Auto generate Vim docs

Author: andrewferrier

doc/debugprint.nvim.txt

@@ -232,8 +232,9 @@ they are used to convert sections to ROT-13, which most folks don’t use.
                                    debugged in the debug message
 
   display_counter     true         Include the increasing integer counter in the debug message.
-                                   (Can also be set to a function to customize, see the
-                                   showcase) for an example
+                                   (If you want to customize this counter, or make it
+                                   non-persistent, see instructions in the showcase for an
+                                   example).
 
   display_snippet     true         Include a snippet of the line above/below in the debug
                                    message (plain debug lines only) for context