Fix typos and latex errors in prob_matrix.md

[natashawatkins]

• I also changed Jupiter notebook settings to only show up to the 3 decimal places

[jstac]

Thanks @natashawatkins !

When I look in "Files changed" I see only a small change to one file. Is anything missing?

[natashawatkins]

@jstac those were all the typos I found. I was trying to change the decimal place display option in Jupyter but that caused the tests to fail, so maybe I will leave that...

[mmcky]

thanks @natashawatkins.

@jstac I am seeing 20 lines have changed. Tom has also reviewed these changes and approves (let me know via email). so I will go ahead and merge this soon.

@natashawatkins Tom asked if you would mind have a look over the Samuelson lecture and "check the killer graph" you put together for that lectures :-).

[jstac]

@natashawatkins @mmcky weird, I'm now seeing all the changes too.

@natashawatkins Thanks heaps, much appreciated!

[natashawatkins]

@mmcky was there anything specific about the plot? I can see some of the legends have gotten a little wonky..