Fix typo

Change-Id: I2d79b299256feefa66ad0b120387d5cab6737345
Reviewed-on: https://gerrit.libreoffice.org/41585Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

uui/source/iahndl.cxx

@@ -975,7 +975,7 @@ executeMessageBox(
 
         if (pDefaultParent)
         {
-            // need to 'Show' to have the following tasks do someting, does
+            // need to 'Show' to have the following tasks do something, does
             // not work without and may even stumble on nullptrs/errors
             xBox->Show();