tracing/tools: fix a couple of spelling mistakes

There is a spelling mistake in the -g help option, I believe
it should be "graph".  There is also a spelling mistake in a
warning message. Fix both mistakes.

Link: https://lkml.kernel.org/r/20210225165248.22050-2-Viktor.Rosendahl@bmw.deSigned-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Viktor Rosendahl <Viktor.Rosendahl@bmw.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/tracing/latency/latency-collector.c

@@ -1650,7 +1650,7 @@ static void start_printthread(void)
 		if (ufd <  0 ||
 		    read(ufd, seed, sizeof(*seed)) != sizeof(*seed)) {
 			printf(
-"Warning! Using trivial random nummer seed, since %s not available\n",
+"Warning! Using trivial random number seed, since %s not available\n",
 			DEV_URANDOM);
 			fflush(stdout);
 			*seed = i;
@@ -1711,8 +1711,8 @@ static void show_usage(void)
 "\t\t\tbeginning, end, and backtrace.\n\n"
 
 "-g, --graph\t\tEnable the display-graph option in trace_option. This\n"
-"\t\t\toption causes ftrace to show the functionph of how\n"
-"\t\t\tfunctions are calling other functions.\n\n"
+"\t\t\toption causes ftrace to show the graph of how functions\n"
+"\t\t\tare calling other functions.\n\n"
 
 "-c, --policy POL\tRun the program with scheduling policy POL. POL can be\n"
 "\t\t\tother, batch, idle, rr or fifo. The default is rr. When\n"