Fix two packages to one package

(Removal of proxy section)

product_docs/docs/pgd/4/admin-manual/installing/04-installing-software.mdx

@@ -62,7 +62,7 @@ If you're installing PGD with EDB Postgres Extended Server or community Postgres
 The first step is to install the packages. For each Postgres package, there's an `edb-bdr4-<postgresversion>` package to go with it. 
 For example, if you're installing EDB Postgres Advanced Server (epas) version 14, you install `edb-bdr4-epas14`. 
 
-There are two other packages to also install: 
+There in one other packages to also install: 
 
 - `edb-pgd-cli` for the PGD command line tool