Remove not needed dsl=2 + error in example

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

docs/basic.md

@@ -17,9 +17,6 @@ Any process can define one or more channels as *input* and *output*. The interac
 A Nextflow script looks like this:
 
 ```groovy
-// Declare syntax version
-nextflow.enable.dsl=2
-
 // Script parameters
 params.query = "/some/data/sample.fa"
 params.db = "/some/path/pdb"
@@ -45,7 +42,7 @@ process extractTopHits {
     path "sequences.txt"
 
     """
-    blastdbcmd -db $db -entry_batch $top_hits > sequences.txt
+    blastdbcmd -db $params.db -entry_batch $top_hits > sequences.txt
     """
 }
 

docs/cli.md

@@ -1430,7 +1430,6 @@ $ nextflow view nextflow-io/hello
 
 == content of file: .nextflow/assets/nextflow-io/hello/main.nf
 #!/usr/bin/env nextflow
-nextflow.enable.dsl=2
 
 process sayHello {
   input:
@@ -1471,7 +1470,6 @@ View the contents of a downloaded pipeline without omitting the header:
 $ nextflow view -q nextflow-io/hello
 
 #!/usr/bin/env nextflow
-nextflow.enable.dsl=2
 
 process sayHello {
   input: