Update example codes for BSP data demo re-submit

From d3592b0 (closure-adv):
==========================

In prisim/examples/codes/BispectrumPhase/,

(*) Update *.ipynb codes corresponding to the bispectrum phase data
analysis demo paper

Author: Nithyanandan Thyagarajan

changelog.txt

@@ -1,3 +1,11 @@
+From d3592b0 (closure-adv):
+==========================
+
+In prisim/examples/codes/BispectrumPhase/,
+
+(*) Update *.ipynb codes corresponding to the bispectrum phase data
+analysis demo paper
+
 From b3cbcec (closure-adv):
 ==========================