KeySet: Fix minor grammar mistake
@@ -151,7 +151,7 @@ static void elektraOpmphmCopy (KeySet * dest ELEKTRA_UNUSED, const KeySet * sour
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* Objects created with ksNew() must be destroyed with ksDel().
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- * You can use a various long list of parameters to preload the keyset
+ * You can use a arbitrary long list of parameters to preload the keyset
* with a list of keys. Either your first and only parameter is 0 or
* your last parameter must be KEY_END.
*
