deb-update.bash: indent comments, add one on if hash

Comments are also moved down to where they belong in case they were
explaining the if hash incorrectly

bash/deb-update.bash

@@ -5,10 +5,11 @@
 # Show commands being executed
 set -x
 
+# if hash checks that the command exists
+if hash apt-get 2>/dev/null; then
     # I am not sure if -y here even does anything, at least it won't work for
     # accepting suite changes for Debian when testing becomes stable.
     # Checking for updates or new packages.
-if hash apt-get 2>/dev/null; then
     apt-get -y update
 
     # If arguments like -y are passed to the script, they become "$@"
@@ -18,24 +19,24 @@ if hash apt-get 2>/dev/null; then
     apt-get "$@" autoremove
 fi
 
-# Flatpak apps are sandboxed and should be safe to update automatically
 if hash flatpak 2>/dev/null; then
+    # Flatpak apps are sandboxed and should be safe to update automatically
     flatpak update --assumeyes --noninteractive
     # Flatpak's version of `apt autoremove`
     flatpak uninstall --unused --assumeyes
 fi
 
+if hash snap 2>/dev/null; then
     # Snap packages auto-update anyway though, but I like checking them while
     # doing everything else too
-if hash snap 2>/dev/null; then
     snap refresh
     # so I may have some sort of an idea when snap packages have been updated
     # if they have auto-refreshed
     snap changes
 fi
 
-# So the local apt-file database is up-to-date.
 if hash apt-file 2>/dev/null; then
+    # So the local apt-file database is up-to-date.
     apt-file update
 fi