fix(dev-docs): Minor Mobile telemetry buffer fixes (#15512)

Replace to be defined with under validation. Remove somewhat confusing
unnecessary description.

Author: philipphofmann

develop-docs/sdk/telemetry/telemetry-buffer/index.mdx

@@ -29,7 +29,7 @@ Therefore, we recommend implementing different types of telemetry buffers tailor
 * [Backend Telemetry Buffer](./backend-telemetry-buffer/): Detailed backend design
 * [Browser Telemetry Buffer](./browser-telemetry-buffer/): To be defined
 * [GDX Telemetry Buffer](./gdx-telemetry-buffer/): To be defined
-* [Mobile Telemetry Buffer](./mobile-telemetry-buffer/): To be defined
+* [Mobile Telemetry Buffer](./mobile-telemetry-buffer/): Spec under validation.
 
 # Common Requirements
 

develop-docs/sdk/telemetry/telemetry-buffer/mobile-telemetry-buffer.mdx

@@ -1,6 +1,5 @@
 ---
 title: Mobile Telemetry Buffer
-description: Detailed mobile telemetry buffer design.
 sidebar_order: 4
 ---