add csv syntax highlighting in template

nf_core/pipeline-template/docs/usage.md

@@ -24,7 +24,7 @@ You will need to create a samplesheet with information about the samples you wou
 
 The `sample` identifiers have to be the same when you have re-sequenced the same sample more than once e.g. to increase sequencing depth. The pipeline will concatenate the raw reads before performing any downstream analysis. Below is an example for the same sample sequenced across 3 lanes:
 
-```console
+```csv title="samplesheet.csv"
 sample,fastq_1,fastq_2
 CONTROL_REP1,AEG588A1_S1_L002_R1_001.fastq.gz,AEG588A1_S1_L002_R2_001.fastq.gz
 CONTROL_REP1,AEG588A1_S1_L003_R1_001.fastq.gz,AEG588A1_S1_L003_R2_001.fastq.gz
@@ -37,7 +37,7 @@ The pipeline will auto-detect whether a sample is single- or paired-end using th
 
 A final samplesheet file consisting of both single- and paired-end data may look something like the one below. This is for 6 samples, where `TREATMENT_REP3` has been sequenced twice.
 
-```console
+```csv title="samplesheet.csv"
 sample,fastq_1,fastq_2
 CONTROL_REP1,AEG588A1_S1_L002_R1_001.fastq.gz,AEG588A1_S1_L002_R2_001.fastq.gz
 CONTROL_REP2,AEG588A2_S2_L002_R1_001.fastq.gz,AEG588A2_S2_L002_R2_001.fastq.gz