docs: add additional Kubernetes deployment path (#1836)

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## This PR
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- Updates installation document to note additional Kubernetes deployment
option per discussion on #1835

### Related Issues
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Fixes #1835

### Notes
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N/A

### Follow-up Tasks
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N/A

### How to test
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Build & look at the docs page.

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Signed-off-by: Sean Killeen <[email protected]>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: SeanKilleen

docs/installation.md

@@ -26,6 +26,8 @@ If you're interested in a full-featured solution for using flagd in Kubernetes,
 
 For more information, see [OpenFeature Operator](./reference/openfeature-operator/overview.md).
 
+You can also choose to run a Kubernetes service in front of a deployment with multiple flagd pods connecting to the same data source. However, if doing so, be aware that synchronization is not instant. The service may return different values after a change until all pods have synchronized with the data source. This synchronization delay is typically brief.
+
 ---
 
 ## Binary