Add benchmark link and NVMe footnote to Managed Postgres overview

[yashpreetbathla]

Summary

• Added a superscript footnote [*] on "Unlimited local IOPS" linking to the AWS EC2 instance store documentation
• Added a link to the Performance benchmarks page for readers who want detailed benchmark results
• Added a standalone line linking to AWS local NVMe limits for more details

Checklist

• Delete items not relevant to your PR
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---

Note

Low Risk
Documentation-only edits with no runtime, security, or data-path impact.

Overview
The Managed Postgres overview doc now qualifies the “Unlimited local IOPS” bullet with a footnote marker and adds reader-facing pointers instead of leaving that claim standalone.

It links to the internal Performance benchmarks page for detailed numbers, and adds a short line with AWS EC2 instance store documentation (memory-, storage-, and CPU-optimized families) so “unlimited” is understood in terms of local NVMe limits on AWS.

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[achudnovskij]

• doesn't need to be link, can just be used as a reference section below

[yashpreetbathla]

[achudnovskij]

This can refer to the start, like

• For local NVMe limits on AWS see [Memory optimized] (https://docs.aws.amazon.com/ec2/latest/instancetypes/mo.html#mo_instance-store), [Storage optimized] (https://docs.aws.amazon.com/ec2/latest/instancetypes/so.html#so_instance-store), [CPU Optimized] (https://docs.aws.amazon.com/ec2/latest/instancetypes/gp.html#gp_instance-store)

[achudnovskij]

Added comments

[mintlify]

Docs PR opened: ClickHouse/mintlify-docs-dev#68

Added an NVMe footnote, a Performance benchmarks link, and an AWS local NVMe limits link to the Managed Postgres overview.

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