Fix typos in help section

// Check whether the category would be supported on the device if the user

// were root.  This function assumes that root is able to write to any file

// that exists.  It performs the same logic as isCategorySupported, but it

// uses file existance rather than writability in the /sys/ file checks.

// uses file existence rather than writability in the /sys/ file checks.

static bool isCategorySupportedForRoot(const TracingCategory& category)

{

    bool ok = category.tags != 0;

                    "  -k fname,...    trace the listed kernel functions\n"

                    "  -n              ignore signals\n"

                    "  -s N            sleep for N seconds before tracing [default 0]\n"

                    "  -t N            trace for N seconds [defualt 5]\n"

                    "  -t N            trace for N seconds [default 5]\n"

                    "  -z              compress the trace dump\n"

                    "  --async_start   start circular trace and return immediatly\n"

                    "  --async_start   start circular trace and return immediately\n"

                    "  --async_dump    dump the current contents of circular trace buffer\n"

                    "  --async_stop    stop tracing and dump the current contents of circular\n"

                    "                    trace buffer\n"