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Update ch18-02-refutability.md

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## Refutability: Whether a Pattern Might Fail to Match ## Refutability(可反驳性): 模式是否会匹配失效
Patterns come in two forms: refutable and irrefutable. Patterns which cannot 模式有两种形式: refutable(可反驳)和irrefutable(不可反驳). 对任意可能的值进行匹配都不会失效的模式被称为是*irrefutable*(不可反驳)的, 而对某些可能的值进行匹配会失效的模式被称为是*refutable*(可反驳)的.
fail to match for any possible value are said to be *irrefutable*, and patterns
which can fail to match for some possible value are said to be *refutable*.
`let` statements, function parameters, and `for` loops are restricted to only `let` statements, function parameters, and `for` loops are restricted to only
accept irrefutable patterns, since there's nothing correct the program could do accept irrefutable patterns, since there's nothing correct the program could do
if the pattern fails to match. `if let`, and `while let` expressions are if the pattern fails to match. `if let`, and `while let` expressions are