Update static-and-const.md (#215)

Let's not use the word "lifetime" just yet. It is arguably the heaviest topic in Rust and it was not yet introduced.

Author: igor-petruk

src/basic-syntax/static-and-const.md

@@ -38,7 +38,7 @@ fn main() {
 }
 ```
 
-As noted in the [Rust RFC Book][1], these are not inlined upon use and have an actual associated memory location.  This is useful for unsafe and embedded code, and have a `'static` lifetime.
+As noted in the [Rust RFC Book][1], these are not inlined upon use and have an actual associated memory location.  This is useful for unsafe and embedded code, and the variable lives through the entirety of the program execution.
 
 
 We will look at mutating static data in the [chapter on Unsafe Rust](../unsafe.md).