The validation script from #10681 is too pedantic, and does not handle
well situations like:
```
cat <<EOF # or <<-EOF
Whether the leading whitespace is stripped out or not by bash
it should still be considered as valid.
EOF
```
This reverts commit
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| mongodb | ||
| apt-cacher-ng.Dockerfile | ||
| apt-cacher-ng.md | ||
| couchdb_data_volumes.md | ||
| mongodb.md | ||
| nodejs_web_app.md | ||
| postgresql_service.Dockerfile | ||
| postgresql_service.md | ||
| running_redis_service.md | ||
| running_riak_service.md | ||
| running_ssh_service.Dockerfile | ||
| running_ssh_service.md | ||