Need to update all EI to MI migration documents on org.wso2.carbon.security.util.ServerCrypto

Description

In the EI 6.1.1 to MI 4.2.0 migration document[1] we have not mentioned about changing the org.wso2.carbon.security.util.ServerCrypto to org.wso2.micro.integrator.security.util.ServerCrypto in WSpolicy files. According to the latest documentation we have mentioned changing the org.wso2.carbon.security.util.ServerCrypto to org.wso2.micro.integrator.security.util.ServerCrypto to avoid the no class found issue. [2]
This needs to be updated in all EI to MI migration documents.

[1].https://github.com/wso2-enterprise/migration-docs/blob/main/api-manager/migration-docs/apim/apim-4.2.0/mi/upgrading-from-ei-6.1.1.md
[2].https://mi.docs.wso2.com/en/latest/develop/advanced-development/applying-security-to-a-proxy-service/

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Start with the linked EI 6.1.1 to MI 4.2.0 migration document and compare its WSPolicy guidance with the referenced security documentation. Search the repository for all EI-to-MI migration documents and the old org.wso2.carbon.security.util.ServerCrypto reference. Done means each relevant document identifies the org.wso2.micro.integrator.security.util.ServerCrypto replacement.