postgresql_copy: add seealso section (#61314)

lib/ansible/modules/database/postgresql/postgresql_copy.py

@@ -18,7 +18,7 @@ DOCUMENTATION = r'''
 module: postgresql_copy
 short_description: Copy data between a file/program and a PostgreSQL table
 description:
-- Copy data between a file/program and a PostgreSQL table U(https://www.postgresql.org/docs/current/sql-copy.html).
+- Copy data between a file/program and a PostgreSQL table.
 version_added: '2.9'
 
 options:
@@ -84,6 +84,11 @@ notes:
   will execute it and rolled the transaction back but pay attention
   it can affect database performance (e.g., if SQL collects a lot of data).
 
+seealso:
+- name: COPY command reference
+  description: Complete reference of the COPY command documentation.
+  link: https://www.postgresql.org/docs/current/sql-copy.html
+
 author:
 - Andrew Klychkov (@Andersson007)