Use unicode pi symbol in pi estimation example. Additional tweaks
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//! println!("{}", tuple)
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//! ```
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//!
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//! ## Monte Carlo estimation of pi
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//! ## Monte Carlo estimation of π
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//!
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//! For this example, imagine we have a square with sides of length 2 and a unit
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//! circle, both centered at the origin. Since the area of a unit circle is pi,
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//! the ratio
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//! circle, both centered at the origin. Since the area of a unit circle is π,
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//! we have:
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//!
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//! ```notrust
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//! (area of unit circle) / (area of square)
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//! (area of unit circle) / (area of square) = π / 4
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//! ```
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//!
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//! is equal to pi / 4. So if we sample many points randomly from the square,
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//! roughly pi / 4 of them should be inside the circle.
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//! So if we sample many points randomly from the square, roughly π / 4 of them
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//! should be inside the circle.
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//!
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//! We can use the above fact to estimate the value of pi: pick many points in the
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//! We can use the above fact to estimate the value of π: pick many points in the
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//! square at random, calculate the fraction that fall within the circle, and
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//! multiply this fraction by 4.
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//!
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