Update function.md

Changed "diverge function" to "diverging functions".

Refer to "https://web.mit.edu/rust-lang_v1.26.0/arch/amd64_ubuntu1404/share/doc/rust/html/rust-by-example/fn/diverging.html#:~:text=Diverging%20functions%20never%20return.,which%20is%20an%20empty%20type.&text=As%20opposed%20to%20all%20the,has%20exactly%20one%20possible%20value."

src/basic/base-type/function.md

@@ -172,7 +172,7 @@ error[E0308]: mismatched types // 类型不匹配
 
 ##### 永不返回的发散函数 `!`
 
-当用 `!` 作函数返回类型的时候，表示该函数永不返回( diverge function )，特别的，这种语法往往用做会导致程序崩溃的函数：
+当用 `!` 作函数返回类型的时候，表示该函数永不返回( diverging functions )，特别的，这种语法往往用做会导致程序崩溃的函数：
 
 ```rust
 fn dead_end() -> ! {