Cleaned transcript for Austin video "Intro to Prob. Programming with PyMC" (#233)

* Update transcript.md Cleaned the entire transcript by adding appropriate punctuations, fixing typos, and correcting formatting inconsistencies. * Update transcript.md * Update about/probabilistic_programming_with_pymc/transcript.md * Update about/probabilistic_programming_with_pymc/transcript.md * Update about/probabilistic_programming_with_pymc/transcript.md --------- Co-authored-by: Reshama Shaikh <reshama.stat@gmail.com>

Author: anushatomar13