Add note about resting spread to sample_pendulum

examples/configs/trader/sample_pendulum.cfg

@@ -29,6 +29,9 @@ AMOUNT_BASE_SELL=100.0
 # The intuition behind this is that in order to complete a roundtrip (buy followed by sell, or sell followed by buy), you will
 # make two trades which will cost you (2 x fee) as a percentage of your order size.
 # By setting a spread value greater than or equal to (2 x fee) you are accounting for the fees as a cost of your trading activities.
+#
+# Note 3: The resting spread is ~33% more than the SPREAD value that you configure here. If you want the resting spread to be ~1% then
+# you should set the SPREAD here at 0.75%.
 SPREAD=0.001
 
 # max number of levels to have on either side. Defines how deep of an orderbook you want to make.
@@ -54,4 +57,4 @@ MIN_QUOTE=0.0
 
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