docs: Regen CLI docs

docs/content/en/commands/hugo_server.md

@@ -59,6 +59,7 @@ hugo server [flags]
       --noHTTPCache            prevent HTTP caching
       --noTimes                don't sync modification time of files
       --path-warnings          print warnings on duplicate target paths etc.
+      --poll                   use a poll based approach to watch for file system changes
   -p, --port int               port on which the server will listen (default 1313)
       --print-mem              print memory usage to screen at intervals
       --renderToDisk           render to Destination path (default is render to memory & serve from there)