Update src/items/functions.md

Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>

Author: gnzlbg

src/items/functions.md

@@ -129,7 +129,7 @@ synonym for `extern "Rust" fn()`. That is, this:
 fn foo() {}
 ```
 
-is identical to 
+is equivalent to:
 
 ```rust
 extern "Rust" fn foo() {}