[#2773] Apply 2 suggestions to 2 files

Author: andrei-pavel

doc/devel/unit-tests.dox

@@ -299,7 +299,7 @@ postgres=# \q
   However, this only affects tables which exist when the privileges are granted.
   To ensure that the user has specific privileges to tables dynamically created
   by the unit tests, the default schema privileges must be altered.
-  In the Postgres 15.0+, you need to explicitly grant privileges to access to
+  In Postgres 15.0+, you need to explicitly grant privileges to access
   the ``public`` schema.
 
   The following example demonstrates how to create the user <i>keatest_readonly</i>,

doc/sphinx/arm/admin.rst

@@ -591,8 +591,8 @@ The PostgreSQL database schema can be upgraded using the same tool and
 commands as described in :ref:`mysql-upgrade`, with the exception that the "pgsql"
 database backend type must be used in the commands.
 
-If you upgraded your Postgres database from a version prior 15.0, you need to grant
-the additional privileges to the user:
+If you upgraded your Postgres database from a version prior to 15.0, you need to
+grant additional privileges to the user:
 
 First, log into PostgreSQL as "postgres":