add comment on what it is based

Author: marcinmachura

bench/algorithm/coro-prime-sieve/1.pony

@@ -1,3 +1,5 @@
+// Based on the Rust #1 implementation.
+
 actor Main
   new create(env: Env) =>
     let n: USize =

bench/algorithm/fasta/1.pony

@@ -1,3 +1,5 @@
+// Based on the Rust #1 implementation.
+
 use "collections"
 
 class RNG

bench/algorithm/helloworld/1.pony

@@ -1,3 +1,4 @@
+// Based on the C #1 implementation.
 use "format"
 
 actor Main

bench/algorithm/lru/1.pony

@@ -1,5 +1,6 @@
 use "collections"
 
+// Based on the Rust #1 implementation.
 class LCG
   let a: U32 = 1103515245
   let c: U32 = 12345

bench/algorithm/spectral-norm/1.pony

@@ -1,3 +1,5 @@
+// Single-threaded implementation of the spectral norm benchmark.
+
 actor Main
   new create(env: Env) =>
     let n: USize = try env.args(1)?.usize()? else 100 end