postgresql: Correcting casing in queries

Queries don't have to be strictly uppercase. In order to be consistent
with doc team standards, making the variables capitalized.

docs/products/postgresql/howto/readonly-user.rst

@@ -8,18 +8,18 @@ Set read-only access in a schema
 
 .. code-block:: bash
 
-   ALTER DEFAULT PRIVILEGES FOR ROLE NAME_OF_ROLE IN SCHEMA NAME_OF_SCHEMA abbreviated_grant_or_revoke
+   alter default privileges for role name_of_role in schema name_of_schema YOUR_GRANT_OR_REVOKE_PERMISSIONS
 
 2.  Apply the new read-only access setting to your existing database objects that uses the affected schema.
 
 .. code-block:: bash
 
-   GRANT SELECT ON ALL TABLES IN SCHEMA NAME_OF_SCHEMA to NAME_OF_READ_ONLY_ROLE
+   grant select on all tables in schema name_of_schema to NAME_OF_READ_ONLY_ROLE
 
 Set read-only access in a database
 ----------------------------------
 You can set up the read-only access for a specific user's role in a particular database.
 
-1. Create a new database which will be used as a template ``CREATE DATABASE ro_<name>_template...``
+1. Create a new database which will be used as a template ``create database ro_<name>_template...``
 2. For the new template database, set permissions and roles that you want as default ones in the template.
-3. When creating a new database, use ``CREATE DATABASE <name> WITH TEMPLATE = 'ro_<name>_template'``
+3. When creating a new database, use ``create database NAME with template = 'ro_<name>_template'``