fixed README typo

Author: olabiyi

Metagenomics/Illumina/Workflow_Documentation/NF_MGIllumina/README.md

@@ -20,14 +20,14 @@ The current GeneLab Illumina metagenomics sequencing data processing pipeline (M
 3. [Fetch Singularity Images](#3-fetch-singularity-images)  
 
 4. [Run the workflow](#4-run-the-workflow)  
-   3a. [Approach 1: Run slurm jobs in singularity containers with OSD accession as input](#4a-approach-1-run-slurm-jobs-in-singularity-containers-with-osd-accession-as-input)   
-   3b. [Approach 2: Run slurm jobs in singularity containers with a csv file as input](#4b-approach-2-run-slurm-jobs-in-singularity-containers-with-a-csv-file-as-input)  
-   3c. [Approach 3: Run jobs locally in conda environments and specify the path to one or more existing conda environments](#4c-approach-run-jobs-locally-in-conda-environments-and-specify-the-path-to-one-or-more-existing-conda-environments)  
-   3d. [Modify parameters and cpu resources in the nextflow config file](#4d-modify-parameters-and-cpu-resources-in-the-nextflow-config-file)  
+   4a. [Approach 1: Run slurm jobs in singularity containers with OSD accession as input](#4a-approach-1-run-slurm-jobs-in-singularity-containers-with-osd-accession-as-input)   
+   4b. [Approach 2: Run slurm jobs in singularity containers with a csv file as input](#4b-approach-2-run-slurm-jobs-in-singularity-containers-with-a-csv-file-as-input)  
+   4c. [Approach 3: Run jobs locally in conda environments and specify the path to one or more existing conda environments](#4c-approach-run-jobs-locally-in-conda-environments-and-specify-the-path-to-one-or-more-existing-conda-environments)  
+   4d. [Modify parameters and cpu resources in the nextflow config file](#4d-modify-parameters-and-cpu-resources-in-the-nextflow-config-file)  
 
 5. [Workflow outputs](#5-workflow-outputs)  
-   4a. [Main outputs](#5a-main-outputs)  
-   4b. [Resource logs](#5b-resource-logs)  
+   5a. [Main outputs](#5a-main-outputs)  
+   5b. [Resource logs](#5b-resource-logs)  
 
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