scripts: Tweaked openio comment

Dang, this touched like every single script.

scripts/plot.py

@@ -132,8 +132,8 @@ def si2(x, w=5):
         s = s.rstrip('.')
     return '%s%s%s' % ('-' if x < 0 else '', s, SI2_PREFIXES[p])
 
+# open with '-' for stdin/stdout
 def openio(path, mode='r', buffering=-1):
-    # allow '-' for stdin/stdout
     import os
     if path == '-':
         if 'r' in mode: