Merge pull request redis#4056 from season89/unstable

Fixed comments of slowlog duration

Author: antirez

src/slowlog.h

@@ -35,7 +35,7 @@ typedef struct slowlogEntry {
     robj **argv;
     int argc;
     long long id;       /* Unique entry identifier. */
-    long long duration; /* Time spent by the query, in nanoseconds. */
+    long long duration; /* Time spent by the query, in microseconds. */
     time_t time;        /* Unix time at which the query was executed. */
     sds cname;          /* Client name. */
     sds peerid;         /* Client network address. */