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>

substrate/frame/democracy/src/benchmarking.rs

@@ -97,8 +97,6 @@ fn account_vote<T: Config>(b: BalanceOf<T>) -> AccountVote<BalanceOf<T>> {
 }
 
 benchmarks! {
-	_ { }
-
 	propose {
 		let p = T::MaxProposals::get();