logcat: help spelling correction

threadtime and added clarity for adverbs

Bug: 29916087
Change-Id: Idbed8bc74147c105eaced940d035d0649a244b18
diff --git a/logcat/logcat.cpp b/logcat/logcat.cpp
index f560491..5bac717 100644
--- a/logcat/logcat.cpp
+++ b/logcat/logcat.cpp
@@ -286,8 +286,8 @@
                     "                  Sets max number of rotated logs to <count>, default 4\n"
                     "  -v <format>, --format=<format>\n"
                     "                  Sets log print format verb and adverbs, where <format> is:\n"
-                    "                    brief long process raw tag thread theadtime time\n"
-                    "                  and modifying adverbs can be:\n"
+                    "                    brief long process raw tag thread threadtime time\n"
+                    "                  and individually flagged modifying adverbs can be added:\n"
                     "                    color epoch monotonic printable uid usec UTC year zone\n"
                     "  -D, --dividers  Print dividers between each log buffer\n"
                     "  -c, --clear     Clear (flush) the entire log and exit\n"