[prob_dist] Update suggestions

[longye-tian]

Dear John @jstac ,

This pull request update prob_dist.md according to #402 .

In particular, this pull request

• update typo "The the " to 'The'
• Make the code in Poisson distribution more concise by deleting some repeated code
• Add x,y labels to all the plots

Best ❤️ Longye

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[longye-tian]

thanks @longye-tian.

I think we should use lower case for the text titles on the x and y axis. CDF and PDF are acronyms so I think they should remain capitalised but I will confirm with @jstac

https://manual.quantecon.org/styleguide/figures.html

Hi Matt,

Thanks! Just updated the labels to lowercase letters except the PMF, CDF, PDF and KDE.

Best, Longye

[mmcky]

thanks @longye-tian.

@jstac this is ready for your final review. It is my understanding that acronyms like PDF should be capitalized. Is that correct?

[mmcky]

thanks @longye-tian for these updates. I will merge this now.