Fix typos.

(cherry picked from commit e0b02c925e)

src/inactivity.cpp

@@ -313,9 +313,9 @@ void inactivity::checkBlacklisted(){
  * \ref blacklisted_running .
  * \param *proc     pointer to the sending KProcess
  * \param *buffer   the char pointer to the output of the process to stdout
- * \param *lenght   the length of the buffer
+ * \param *length   the length of the buffer
  */
-void inactivity::getPIDs(KProcess */*proc*/, char *buffer, int /*lenght*/) {
+void inactivity::getPIDs(KProcess */*proc*/, char *buffer, int /*length*/) {
 	kdDebugFuncIn(trace);
 
 	TQString pids(buffer);