support/scripts/size-stats: fix copy/paste error in ArgumentParser

A copy/paste error in the ArgumentParser() constructor call disclosed
the fact that the author of the script has shamefully based his work
on the existing graph-build-time script. This commit fixes this
mistake, therefore hiding in a better way how size-stats was
vampirized from graph-build-time.

Reported-by: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

support/scripts/size-stats

@@ -191,7 +191,7 @@ def gen_packages_csv(pkgsizes, outputf):
         for (pkg, size) in pkgsizes.items():
             wr.writerow([pkg, size, "%.1f" % (float(size) / total * 100)])
 
-parser = argparse.ArgumentParser(description='Draw build time graphs')
+parser = argparse.ArgumentParser(description='Draw size statistics graphs')
 
 parser.add_argument("--builddir", '-i', metavar="BUILDDIR", required=True,
                     help="Buildroot output directory")