[vEnhance]

Closes #66.

Proofread all the src/*.typ files included under Part India (vecfield.typ, gcd.typ, work.typ, ftcgreen.typ, 2dflux.typ, lineex.typ, mt3.typ). Found and fixed the following minor issues:

src/vecfield.typ

• Word-choice error: a whirlpool swirls around its vortex, not its "vertex".
• Word-choice error: the downstream function increases as you get farther from the head of the river (not "the bank", which refers to the side rather than position along the river).
• Grammar: "I want tell you" → "I want to tell you".
• Grammar: "the gradient creates into a vector field" → "the gradient creates a vector field".
• Duplicate word: "what this means for each individual red arrow means" → "...for each individual red arrow".

src/work.typ

• Typo: "Then notation" → "The notation".
• Calculation error: in the bare-hands work example, the vector field was evaluated as F(0, 1-2t) but the parametrization is r(t) = (1-2t, 0), so it should be F(1-2t, 0). (The displayed final vector (0, 3-6t) was already correct, only the intermediate function-application notation had the arguments swapped.)

src/ftcgreen.typ

• The prose said to "integrate ... from 0 to π/2" while the displayed integral correctly used bounds 0 to π — fixed the prose to match.
• The displayed antiderivative -cos(2t) - cos(t) was missing a factor of 1/4 and had the wrong sign on cos(t); corrected to -cos(2t)/4 + cos(t), which integrates the given integrand correctly and yields the stated answer of -2.
• Grammar: "will always just equal to $c$" → "will always just equal $c$".

src/2dflux.typ

• In a flux example, the rotated vector field $vec(-q,p)$ was mislabeled as vec(cos(t)^2, sin(t)^2) (which is actually $vec(p,q)$); corrected to vec(-sin(t)^2, cos(t)^2), and fixed the subsequent dot-product expansion to match. The final boxed answer was unaffected.

No large mathematical errors were found; all final boxed answers in this part were independently re-derived and confirmed correct.

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