sra-download -> sra_download -- match code

anvio/docs/workflows/sra-download.md

@@ -1,4 +1,4 @@
-The `sra-download` workflow is a Snakemake workflow that downloads FASTQ files from SRA-accessions using [NCBI sra-tools wiki](https://github.com/ncbi/sra-tools/wiki/08.-prefetch-and-fasterq-dump), gzips them using [pigz](https://zlib.net/pigz/), and provides a %(samples-txt)s. You will need to have these tools installed before you start.
+The `sra_download` workflow is a Snakemake workflow that downloads FASTQ files from SRA-accessions using [NCBI sra-tools wiki](https://github.com/ncbi/sra-tools/wiki/08.-prefetch-and-fasterq-dump), gzips them using [pigz](https://zlib.net/pigz/), and provides a %(samples-txt)s. You will need to have these tools installed before you start.
 
 Let's get started.
 
@@ -9,7 +9,7 @@ Let's get started.
 The first step is to make a %(workflow-config)s.
 
 ```bash
-anvi-run-workflow -w sra-download --get-default-config sra_download_config.json
+anvi-run-workflow -w sra_download --get-default-config sra_download_config.json
 ```
 
 Here's what the %(workflow-config)s file looks like:
@@ -36,7 +36,7 @@ $ cat sra_download_config.json
     },
     "max_threads": "",
     "config_version": "3",
-    "workflow_name": "sra-download"
+    "workflow_name": "sra_download"
 ```
 
 #### Modify any of the bells and whistles in the config file
@@ -50,7 +50,7 @@ Feel free to adjust anything in the config file! Here are some to consider:
 
 ### List of SRA accessions
 
-The input for the `sra-download` workflow is `SRA_accession_list.txt`. This contains a list of your SRA accession you would like to download and it looks like this:
+The input for the `sra_download` workflow is `SRA_accession_list.txt`. This contains a list of your SRA accession you would like to download and it looks like this:
 
 ```bash
 $ cat SRA_accession_list.txt
@@ -69,7 +69,7 @@ Here's a basic command to start the workflow:
 ### Run on your local computer
 
 ```bash
-anvi-run-workflow -w sra-download -c sra_download_config.json
+anvi-run-workflow -w sra_download -c sra_download_config.json
 ```
 
 ### Go big and use an HPC!