init: update instructions to run project from a fresh scaffold (#2996)

After scaffolding the project with 
```
deno run -Ar jsr:@fresh/init@2.0.0-alpha.34
```
Instruction show up to run the project:
```
Enter your project directory using cd fresh-project.
Run deno task start to start the project. CTRL-C to stop.

Stuck? Join our Discord https://discord.gg/deno
```
these instructions seem to be outdated since running `deno task start`
on this project throws an error.

While this error also hints that you might want to run the dev server, I
think it gives a bad impression that a newly scaffolded project is
throwing an error after running the command that it has specified. Also,
not many people, especially beginners, read the error messages
completely.

Author: maheshbansod

init/src/init.ts

@@ -684,7 +684,7 @@ This will watch the project directory and restart as necessary.`;
     );
   }
   console.log(
-    "Run %cdeno task start%c to start the project. %cCTRL-C%c to stop.",
+    "Run %cdeno task dev%c to start the project. %cCTRL-C%c to stop.",
     "color: cyan",
     "",
     "color: cyan",