Update Migration topic with fixed material and better formatting (#889)

This PR fixes some minor visual issues in migration.md

Author: Andriciuc

docs/migration.md

@@ -1,17 +1,16 @@
-# Migrate from PostgreSQL to Percona Distribution for PostgreSQL 
-
+# Migrate from PostgreSQL to Percona Distribution for PostgreSQL
 
 Percona Distribution for PostgreSQL includes the PostgreSQL database and additional extensions that have been selected to cover the needs of the enterprise and are guaranteed to work together. Percona Distribution for PostgreSQL is available as a software collection that is easy to deploy.
 
-We encourage users to migrate from their PostgreSQL deployments based on community binaries to Percona Distribution for PostgreSQL. This document provides the migration instructions. 
+We encourage users to migrate from their PostgreSQL deployments based on community binaries to Percona Distribution for PostgreSQL. This document provides the migration instructions.
 
-Depending on your business requirements, you may migrate to Percona Distribution for PostgreSQL either [on the same server](#migrate-on-the-same-server) or [onto a different server](#migrate-on-a-different-server). 
+Depending on your business requirements, you may migrate to Percona Distribution for PostgreSQL either [on the same server](#migrate-on-the-same-server) or [onto a different server](#migrate-on-a-different-server).
 
 ## Migrate on the same server
 
-=== ":material-debian: :material-debian: On Debian and Ubuntu Linux"
+=== ":material-debian: On Debian and Ubuntu Linux"
 
-     >To ensure that your data is safe during the migration, we recommend to make a backup of your data and all configuration files (such as `pg_hba.conf`, `postgresql.conf`, `postgresql.auto.conf`) using the tool of your choice. The backup process is out of scope of this document. You can use `pg_dumpall` or other tools of your choice. For more information, see the blog post [PostgreSQL Upgrade Using pg_dumpall](https://www.percona.com/blog/postgresql-upgrade-using-pg_dumpall/) by _Avinash Vallarapu_, _Fernando Laudares Camargos_, _Jobin Augustine_ and _Nickolay Ihalainen_.
+     >To ensure that your data is safe during the migration, we recommend to make a backup of your data and all configuration files (such as `pg_hba.conf`, `postgresql.conf`, `postgresql.auto.conf`) using the tool of your choice. The backup process is out of scope of this document. You can use `pg_dumpall` or other tools of your choice. For more information, see the blog post [PostgreSQL Upgrade Using pg_dumpall :octicons-link-external-16:](https://www.percona.com/blog/postgresql-upgrade-using-pg_dumpall/) by _Avinash Vallarapu_, _Fernando Laudares Camargos_, _Jobin Augustine_ and _Nickolay Ihalainen_.
 
     Run **all** commands as root or via **sudo**:
     {.power-number}
@@ -49,7 +48,6 @@ Depending on your business requirements, you may migrate to Percona Distribution
            $ sudo systemctl start postgresql.service
            ```
 
-
 === ":material-redhat: On RHEL and derivatives"
 
        > To ensure that your data is safe during the migration, we recommend to make a backup of your data and all configuration files (such as `pg_hba.conf`, `postgresql.conf`, `postgresql.auto.conf`) using the tool of your choice. The backup process is out of scope of this document. You can use `pg_dumpall` or other tools of your choice. 
@@ -84,15 +82,13 @@ Depending on your business requirements, you may migrate to Percona Distribution
           $ sudo systemctl start postgresql-{{pgversion}}
           ```
 
-
 ## Migrate on a different server
 
 In this scenario, we will refer to the server with PostgreSQL Community as the "source" and to the server with Percona Distribution for PostgreSQL as the "target".
 
 To migrate from PostgreSQL Community to Percona Distribution for PostgreSQL on a different server, do the following:
 
-**On the source server**:
-{.power-number}
+### **On the source server** {.power-number}
 
 1. Back up your data and all configuration files (such as `pg_hba.conf`, `postgresql.conf`, `postgresql.auto.conf`) using the tool of your choice.
 2. Stop the `postgresql` service
@@ -109,12 +105,11 @@ To migrate from PostgreSQL Community to Percona Distribution for PostgreSQL on a
          $ sudo systemctl stop postgresql-{{pgversion}}
          ```
 
-3. Optionally, remove PostgreSQL Community packages 
+3. Optionally, remove PostgreSQL Community packages
 
-**On the target server**:
-{.power-number}
+### **On the target server** {.power-number}
 
-1. [Install percona-release :octicons-link-external-16:](https://docs.percona.com/percona-software-repositories/installing.html) 
+1. [Install percona-release :octicons-link-external-16:](https://docs.percona.com/percona-software-repositories/installing.html)
 2. Enable the repository
 
     ```{.bash data-prompt="$"}
@@ -135,4 +130,4 @@ To migrate from PostgreSQL Community to Percona Distribution for PostgreSQL on a
 
          ```{.bash data-prompt="$"}
          $ sudo systemctl start postgresql-{{pgversion}}
-         ```
+         ```