[DOCS] Adding metadata to articles (#18331)

* adding-metadata

* Apply suggestions from code review

Co-authored-by: Tatiana Savina <tatiana.savina@intel.com>

* Apply suggestions from code review

Co-authored-by: Tatiana Savina <tatiana.savina@intel.com>

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Co-authored-by: Tatiana Savina <tatiana.savina@intel.com>

docs/optimization_guide/dldt_deployment_optimization_tput.md

@@ -2,6 +2,12 @@
 
 @sphinxdirective
 
+.. meta::
+   :description: Throughput-oriented approaches in OpenVINO involve 
+                 execution of a large number of inference requests 
+                 simultaneously which improves the device utilization.
+
+
 As described in the section on the :doc:`latency-specific considerations <openvino_docs_deployment_optimization_guide_latency>`, one of the possible use cases is *delivering every single request at the minimal delay*.
 Throughput, on the other hand, is about inference scenarios in which potentially **large number of inference requests are served simultaneously to improve the device utilization**.