Fix docstring typo in nucleus sampling

[Chessing234]

Summary

• Fixes Minor corrections in documentation for Nucleus Sampling implementation #293
• Fixed "is less that $p$" to "is at least $p$" in the module docstring (line 22) — corrects both the typo ("that" -> "than") and the semantics ("less than" -> "at least"), since nucleus sampling selects the smallest set of tokens whose cumulative probability meets or exceeds p
• Fixed "less that" to "less than" in an inline comment (line 64) — typo-only fix, semantics were correct there

Test plan

• Verified the fix matches the formula already present in the docstring: $\sum_{x_i \in V^{(p)}} P(x_i | x_{1:i-1}) \ge p$

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