Fix signature

Co-authored-by: Nico Sammito <nsammito@code0.tech>
Signed-off-by: Dario Pranjic <96529060+Knerio@users.noreply.github.com>

Author: Knerio

ts/examples/simple-example-ts/index.ts

@@ -23,7 +23,7 @@ sdk.registerDataTypes({
 })
 
 @Identifier("fib")
-@Signature("(number: number) => number")
+@Signature("(number: number): number")
 @RuntimeParameter({
     runtimeName: "number",
     defaultValue: 20