zsh-completion: add missing completions for systemd-tmpfiles

(cherry picked from commit ee14023fd5)

shell-completion/zsh/_systemd-tmpfiles

@@ -1,10 +1,13 @@
 #compdef systemd-tmpfiles
 
 _arguments \
+    {-h,--help}'[Show help]' \
+    '--version[Show package version]' \
     '--create[Create, set ownership/permissions based on the config files.]' \
     '--clean[Clean up all files and directories with an age parameter configured.]' \
     '--remove[All files and directories marked with r, R in the configuration files are removed.]' \
+    '--boot[Execute actions only safe at boot]' \
     '--prefix=[Only apply rules that apply to paths with the specified prefix.]' \
     '--exclude-prefix=[Ignore rules that apply to paths with the specified prefix.]' \
-    '--help[Prints a short help text and exits.]' \
+    '--root=[Operate on an alternate filesystem root]:directory:_directories' \
     '*::files:_files'