Fix typesetting issues in Chapters 25 and 26.

[rkirsling]

The chapters on Algebras for Monads and Ends and Coends have a few typesetting issues (which were introduced in #66):

• An instance where "object a" is written as "object A"
• Two instances where the Kleisli category C_T is written as C^T
• Two instances where → is written as ->

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By the way, so far I've only been making corrections when the TeX differs from the original text, but I notice there are a couple of spelling errors as well as another typesetting error (µ_{T b} instead of µ_Tb) which are also present in the original text. Should I fix these as well, or somehow make note of them separately?

[hmemcpy]

Hey! First, thanks again for those fixes! By the later chapters I think I was fixing LaTeX on autopilot :) Appreciate the help!
There have been a few spelling errors corrections sent, they're always welcomed, and you can send them in this PR or separate, whichever you prefer!

[rkirsling]

Haha, it's a lot of text to verify! I'm in the luxurious position of reading it for the first time, so I feel like reporting things I encounter is the least I can do. 😄

I'll separate the other corrections I mentioned into a separate PR, but since I noticed another instance of a -> that should be a → in the following chapter, I've added that one here.

[hmemcpy]

Amazing! Thanks, and I'll add your name to the contributor's list :)

[hmemcpy]

Also, if at all possible, could you also modify errata.md and specify those changes? I'd like to track them for any potential 2nd edition :)