Update .spec.configuration API changes

[obaydullahmhs]

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[ArnobKumarSaha]

Whats remaining here ?

[refat75]

File: docs/guides/mariadb/reconfigure/cluster/index.md
Line: 374

There's a line like:

If everything goes well, `KubeDB` Enterprise operator will update the `configSecret` of `MariaDB` object.

For applyConfig we don't update the configSecret of DB object. Rather we update the configuration.inline field of DB object.

Maybe it can be rewritten as:

If everything goes well, `KubeDB` operator will update the `configuration` field  of `MariaDB` object.

Any thought on this?
@souravbiswassanto @sheikh-arman @Neaj-Morshad-101

[ArnobKumarSaha]

Ready to merge ?

[souravbiswassanto]

Can be merged after resolving last review.

[souravbiswassanto]

ready for merge