Nit: better text asking for copying (#136)

It's conventional and more user-friendly to tell which prompts are
accepted (even if more than that would actually work), so user isn't
worried about typing wrong things

Also, no space before question mark in English

Update scripts/functions.sh

scripts/functions.sh

@@ -251,7 +251,7 @@ function cleanup {
       copyOutput
     elif [ "$copy" = "prompt" ]; then
       while true; do
-        read -rp "Copy the capture output locally ?" yn
+        read -rp "Copy the capture output locally? [yes/no] " yn
         case $yn in
         [Yy]*)
           copyOutput