docs: clean up IP allow list URLs and security info re: data planes (#67074)

## What
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* Describe what the change is solving. Link all GitHub issues related to
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This is minor docs cleanup after we released the Iowa region on GCP.
There's not much to update, but it did prompt me to take a look at a few
things, update some URLs, and reframe the discussion of how Airbyte is
deployed to Cloud.

Companion change to this UI update, but there is no dependency between
them. https://github.com/airbytehq/airbyte-platform-internal/pull/17923

## How
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## Review guide
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1. `x.py`
2. `y.py`
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## User Impact
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## Can this PR be safely reverted and rolled back?
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- [x] YES 💚
- [ ] NO ❌

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

docs/integrations/sources/mysql.md

@@ -91,10 +91,10 @@ To fill out the required information:
 
 <!-- env:cloud -->
 
-#### Step 4: (Airbyte Cloud Only) Allow inbound traffic from Airbyte IPs.
+#### Step 4: (Airbyte Cloud Only) Allow inbound traffic from Airbyte IPs
 
 If you are on Airbyte Cloud, you will always need to modify your database configuration to allow inbound traffic from Airbyte IPs. You can find a list of all IPs that need to be allowlisted in
-our [Airbyte Security docs](../../platform/operating-airbyte/security#network-security-1).
+our [Airbyte Security docs](../../platform/operating-airbyte/ip-allowlist).
 
 Now, click `Set up source` in the Airbyte UI. Airbyte will now test connecting to your database. Once this succeeds, you've configured an Airbyte MySQL source!
 

docs/integrations/sources/postgres.md

@@ -66,10 +66,10 @@ To fill out the required information:
 
 <!-- env:cloud -->
 
-### Step 3: (Airbyte Cloud Only) Allow inbound traffic from Airbyte IPs.
+### Step 3: (Airbyte Cloud Only) Allow inbound traffic from Airbyte IPs
 
 If you are on Airbyte Cloud, you will always need to modify your database configuration to allow inbound traffic from Airbyte IPs. You can find a list of all IPs that need to be allowlisted in
-our [Airbyte Security docs](../../platform/operating-airbyte/security#network-security-1).
+our [Airbyte Security docs](../../platform/operating-airbyte/ip-allowlist).
 
 Now, click `Set up source` in the Airbyte UI. Airbyte will now test connecting to your database. Once this succeeds, you've configured an Airbyte Postgres source!
 

docs/integrations/sources/postgres/cloud-sql-postgres.md

@@ -61,7 +61,7 @@ If you are on Airbyte Cloud, you will always need to modify your database config
 
    ![Add a Network](./assets/airbyte_cloud_sql_postgres_add_network.png)
 
-2. Add a new network, and enter the Airbyte's IPs, which you can find in our [Airbyte Security documentation](../../../platform/operating-airbyte/security#network-security-1).
+2. Add a new network, and enter the Airbyte's IPs, which you can find in our [Airbyte Security documentation](../../../platform/operating-airbyte/ip-allowlist).
 
 Now, click `Set up source` in the Airbyte UI. Airbyte will now test connecting to your database. Once this succeeds, you've configured an Airbyte Postgres source!
 

docs/platform/operating-airbyte/security.md

@@ -95,7 +95,7 @@ Airbyte Cloud leverages the security features of leading Cloud providers and set
 
 ### Physical infrastructure
 
-Airbyte Cloud is currently deployed on GCP with all servers located in the United States. We use isolated pods to ensure your data is kept separate from other customers’ data.
+Airbyte Cloud uses control planes on GCP in the United States. Airbyte uses isolated pods to keep your data separate from other customers’ data. Data planes [are available](../cloud/managing-airbyte-cloud/manage-data-residency) in the United States (GCP) and European Union (AWS). If you [deploy your own data plane](../enterprise-flex/), that data plane runs in your own infrastructure.
 
 Only certain Airbyte staff can access Airbyte infrastructure and technical logs for deployments, upgrades, configuration changes, and troubleshooting.