Prettify

Signed-off-by: Marcel Ribeiro-Dantas <mribeirodantas@seqera.io>

docs/hello_nextflow/02_hello_world.md

@@ -112,7 +112,6 @@ Let's open the script and look at how it's structured.
 
     The file is in the current directory. Optionally, you can type `ls` in the terminal and Ctrl+Click on the file to open it. If you're on macOS, you can use Cmd+Click.
 
-
 The first block of code describes a **process** called `sayHello` that writes its output to `stdout`:
 
 ```groovy title="hello-world.nf"

docs/hello_nextflow/03_hello_gatk.md

@@ -377,6 +377,7 @@ reads_ch = Channel.of(params.reads_bam)
 ```
 
 _After:_
+
 ```groovy title="hello-gatk.nf"
 // Create input channel (multiple files via CLI parameter)
 reads_ch = Channel.fromList(params.reads_bam)