Follow-up from "Blog: 1st version of DLE in AWS Marketplace"

The following discussions from !476 (merged) should be addressed:

@vitabaks started a discussion:

@NikolayS perhaps it is worth giving more information here? this is an important point. So that the disk size is not too small, but there is some margin. It is possible to describe some formulas.
@vitabaks started a discussion:
```
- number of pg_dump jobs – for better speed, you can use the number of vCPUs on the source machine. **Attention**! be careful not to specify too many jobs if the source is under load.
```
I am afraid that the user will not read to the end and will simply indicate the number of jobs equal to the number of CPU cores on the source. This may be bad practice if the source is under high load.

- the value of [`shared_preload_libraries`](https://postgresqlco.nf/doc/en/param/shared_preload_libraries/) – it is a CSV list of Postgres extensions (the minimal recommended value is `pg_stat_statements,pg_stat_kcache,auto_explain,logerrors`), and addition, it is recommended to check the value of the `shared_preload_libraries` parameter on the source to make sure that all the necessary extensions are specified (for example, `timescaledb`).
pg_stat_kcache - is required for observing

and addition, it is recommended to check the value of the shared_preload_libraries parameter on the source to make sure that all the necessary extensions are specified (for example, timescaledb).

@vitabaks started a discussion: (+1 comment)

- list of databases (separated by commas) to copy from the source. Leave it empty to copy all accessible databases.
What is a CSV list? Maybe just "separated by commas"?

@vitabaks started a discussion: (+1 comment)

- Log in into AWS: https://console.aws.amazon.com

@vitabaks started a discussion:

AWS Marketplace version of DLE is currently in preview – you can see it checking the version – it contains the preview suffix (e.g., 3.1.1-aws2-preview). There are certain limitations as described in the blog post. When the GA version will be published in AWS Marketplace, it will come without preview suffix.

it seemed superfluous to me. I recommend removing it to reduce the amount of text (to make the how-to easier).