feature_flags docs: fix link anchor to Unleash SDKs

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What does this MR do?

It updates the anchor in the link to the list of Unleash SDKs because the existing link was broken.

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doc/operations/feature_flags.md

@@ -282,7 +282,7 @@ With the Unleash client, developers can define, in the application code, the def
 Each feature flag evaluation can express the desired outcome if the flag isn't present in the
 provided configuration file.
 
-Unleash currently [offers many SDKs for various languages and frameworks](https://github.com/Unleash/unleash#client-implementations).
+Unleash currently [offers many SDKs for various languages and frameworks](https://github.com/Unleash/unleash#unleash-sdks).
 
 ### Feature flags API information