docs: Update import commands for state changes section

[john-terraform]

Description

Update terraform import example commands in UPGRADE-2.0.md.

Current terraform import commands in the State Changes example snippet suggest importing SG rules, created via pre 2.0 module versions, using the pattern of an SG rule ID that belongs to aws_security_group_rule resource (i.e. sg-xxx).
Meanwhile, the aws_vpc_security_group_ingress_rule resource ID for import is slightly different (i.e. sgr-xxx).

Motivation and Context

• Accurate documentation is nice

Breaking Changes

• N/A

How Has This Been Tested?

• I have executed pre-commit run -a on my pull request

[bryantbiggs]

actually, this is wrong - security group IDs start with sg-*. Either way, its just a reference for what users need to provide since we cannot tell them what their security group ID is

[john-terraform]

@bryantbiggs, you are right about the security group IDs. In this particular case, the reference is made for importing existing security group rules, not the security group resources, due to migration from a single aws_security_group_rule resource to instances of aws_vpc_security_group_ingress_rule within the module in 2.0.0.

In this PR, I adjusted the import reference for aws_vpc_security_group_ingress_rule accordingly, which should include the security group rule ID [Resource: aws_vpc_security_group_ingress_rule].

Came across this document today, while upgrading to the EFS module 2.0.0, noticed this minor mistake (probably someone's typo), and decided to correct it.

[antonbabenko]

This PR is included in version 2.1.0 🎉