Add description of CheckItem

include/functions

@@ -28,6 +28,7 @@
 #    AddSetting                 Addition of setting
 #    AddSystemGroup             Adds a system to a group
 #    CheckFilePermissions       Check file permissions
+#    CheckItem                  Test for presence of a string in report file
 #    CheckUpdates               Determine if a new version of Lynis is available
 #    CleanUp                    Clean up files before closing program
 #    CountTests                 Count number of performed tests