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 <[email protected]>

Author: stanly-johnson

src/benchmarking.rs

@@ -63,8 +63,6 @@ pub fn create_heartbeat<T: Config>(k: u32, e: u32) ->
 }
 
 benchmarks! {
-	_{ }
-
 	#[extra]
 	heartbeat {
 		let k in 1 .. MAX_KEYS;