Update README.md

Fixed duplicated warning message

Author: AlenaNik

README.md

@@ -74,10 +74,8 @@ CONTROL_REP1,AEG588A1_S1_L004_R1_001.fastq.gz,AEG588A1_S1_L004_R2_001.fastq.gz,a
 
 Each row represents a fastq file (single-end) or a pair of fastq files (paired end). Rows with the same sample identifier are considered technical replicates and merged automatically. The strandedness refers to the library preparation and will be automatically inferred if set to `auto`.
 
-> **Warning:**
-> Please provide pipeline parameters via the CLI or Nextflow `-params-file` option. Custom config files including those
-> provided by the `-c` Nextflow option can be used to provide any configuration _**except for parameters**_;
-> see [docs](https://nf-co.re/usage/configuration#custom-configuration-files).
+> [!WARNING]
+> Please provide pipeline parameters via the CLI or Nextflow `-params-file` option. Custom config files including those provided by the `-c` Nextflow option can be used to provide any configuration _**except for parameters**_; see [docs](https://nf-co.re/docs/usage/getting_started/configuration#custom-configuration-files).
 
 Now, you can run the pipeline using:
 
@@ -90,9 +88,6 @@ nextflow run nf-core/rnaseq \
     -profile <docker/singularity/.../institute>
 ```
 
-> [!WARNING]
-> Please provide pipeline parameters via the CLI or Nextflow `-params-file` option. Custom config files including those provided by the `-c` Nextflow option can be used to provide any configuration _**except for parameters**_; see [docs](https://nf-co.re/docs/usage/getting_started/configuration#custom-configuration-files).
-
 For more details and further functionality, please refer to the [usage documentation](https://nf-co.re/rnaseq/usage) and the [parameter documentation](https://nf-co.re/rnaseq/parameters).
 
 ## Pipeline output