minor symfony#632 Remove redundant vectorFieldName parameter from MariaDB example (OskarStark)

This PR was merged into the main branch.

Discussion
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 Remove redundant `vectorFieldName` parameter from MariaDB example

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        | --
| License       | MIT

The 'embedding' value is the default for vectorFieldName parameter, so it can be omitted to simplify the example code.

Commits
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fd8da1a Remove redundant vectorFieldName parameter from MariaDB example

Author: OskarStark

examples/memory/mariadb.php

@@ -34,7 +34,6 @@
     connection: DriverManager::getConnection((new DsnParser())->parse($_ENV['MARIADB_URI'])),
     tableName: 'my_table_memory',
     indexName: 'my_index',
-    vectorFieldName: 'embedding',
 );
 
 // our data