Update chp_10.md / Section 10.2.2

[st--]

Clean up equation and make code example consistent

• \text for text within equations
• \texttt to set the variable names in monospace as in the following code example
• use same names in code example as in equation (also fixes bug in code example)

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[canyon289]

@st-- Thanks for contribution. Consider this approved, I'm just making a list for myself below to fix this in all spots. Is there a name you'd like us to credit the errata to or does the handle @st-- fork for you?

• Changed manuscript
• Changed code notebook reference
• Added to Errata

[st--]

For the credits, ST John works:)

[canyon289]

Updated via #122

Thanks much @st-- !