Update custom-postgres-config.mdx | added pg_net variables to "configurable list"

[TheOtherBrian1]

I have read the CONTRIBUTING.md file.

YES

What kind of change does this PR introduce?

docs update

What is the current behavior?

pg_net.ttl nor pg_net.batch_size are not referenced as a configurable in the docs.

What is the new behavior?

lists variables as configurable

Additional context

As of pg_net v0.10.0, the supautils extension allows it to be configured

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