fix: Add local function 🐛

Author: kdheepak

scripts/panvimdoc.lua

@@ -176,7 +176,7 @@ local function renderNotes()
   return table.concat(t, "\n") .. "\n"
 end
 
-function renderFooter()
+local function renderFooter()
   return [[Generated by panvimdoc <https://github.com/kdheepak/panvimdoc>
 
 vim:tw=78:ts=8:noet:ft=help:norl:]]