Re #6152. Wiki documentation update.

Code/Mantid/Framework/Algorithms/src/FilterByLogValue.cpp

@@ -8,7 +8,7 @@ Filters out events using the entries in the Sample Logs.
 Sample logs consist of a series of <Time, Value> pairs. The first step in filtering is to generate a list of start-stop time intervals that will be kept, using those logs.
 * Each log value is compared to the min/max value filters to determine whether it is "good" or not.
 ** For a single log value that satisfies the criteria at time T, all events between T+-Tolerance (LogBoundary=Centre), or T and T+Tolerance (LogBoundary=Left) are kept.
-** If there are several consecutive log values matching the filter, events between T1-Tolerance and T2+Tolerance (LogBoundary=Centre), or T1 and T2+Tolerance (LogBoundary=Left) are kept.
+** If there are several consecutive log values matching the filter, events between T1-Tolerance and T2+Tolerance, where T2 is the last "good" value (LogBoundary=Centre), or T1 and T2, where T2 is the first "bad" value (LogBoundary=Left) are kept.
 * The filter is then applied to all events in all spectra. Any events with pulse times outside of any "good" time ranges are removed.
 
 There is no interpolation of log values between the discrete sample log times at this time.