Fix spelling error, thanks Mark

docker/README.md

@@ -94,7 +94,7 @@ sudo docker build --tag gitlab-data docker/data/
 sudo docker build --tag gitlab-app:7.10.1 docker/app/
 ```
 
-After this run the images as described in the prepivous section.
+After this run the images as described in the previous section.
 
 We assume using a data volume container, this will simplify migrations and backups.
 This empty container will exist to persist as volumes the 3 directories used by GitLab, so remember not to delete it.
@@ -152,4 +152,4 @@ sudo docker push sytse/gitlab_data
 
 ## Troubleshooting
 
-Please see the [troubleshooting](troubleshooting.md) file in this directory.
+Please see the [troubleshooting](troubleshooting.md) file in this directory.
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