fix : remove _{ } syntax from benchmark macro (#7822)

* commented use of common

* hack to pass tests

* another hack

* remove all commented code

* fix the easy tests

* temp hack

* follow through comma hack until better solution

* patch macro

* missed one

* update benchmarks

* update docs

* fix docs

* removed too much

* fix changes

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

Author: stanly-johnson

src/benchmarking.rs

@@ -30,8 +30,6 @@ use crate::Module as Timestamp;
 const MAX_TIME: u32 = 100;
 
 benchmarks! {
-	_ { }
-
 	set {
 		let t = MAX_TIME;
 		// Ignore write to `DidUpdate` since it transient.