[39_exchangeable]_punctuations_correction

[shlff]

Hi @jstac , this PR does two jobs in lecture exchangeable:

• adds . at the end of following sentences
  • You can read about exchangeability `here <https://en.wikipedia.org/wiki/Exchangeable_random_variables>`__
  • Outcomes depend on a peculiar property of likelihood ratio processes that are discussed in `this lecture <https://python-advanced.quantecon.org/additive_functionals.html>`__
• adds missing ) in the following sentences
  • where we regard :math:`\pi` as the decision maker's **subjective probability** (also called a **personal probability**. -->> where we regard :math:`\pi` as the decision maker's **subjective probability** (also called a **personal probability**).
  • (i.e., a Beta distribution with parameters :math:`F_a=1, F_b=1`, while :math:`g` is a Beta distribution with the default parameter values :math:`G_a=3, G_b=1.2`. -->> (i.e., a Beta distribution with parameters :math:`F_a=1, F_b=1`), while :math:`g` is a Beta distribution with the default parameter values :math:`G_a=3, G_b=1.2`.

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[jstac]

Thanks @shlff , nice work.