Fix spelling and grammar errors in comments (#15370)

- dbus.rs: fix grammar (add 'between', pluralize 'processes')
- win_impl.rs: fix typo 'hight' -> 'high', idiom 'such called' -> 'so-called'
- startwm.sh: fix typo 'loging' -> 'logging'
- lib.rs: fix copy-paste error in doc comments for scroll buttons
- message.proto: fix typo 'Clipobard' -> 'Clipboard'

res/startwm.sh

@@ -45,7 +45,7 @@ pre_start()
   return 0
 }
 
-# When loging out from the interactive shell, the execution sequence is:
+# When logging out from the interactive shell, the execution sequence is:
 #
 # IF ~/.bash_logout exists THEN
 #     execute ~/.bash_logout