docs: fix duplicate conclusion labels

[ArivunidhiA]

Add unique reference labels for conclusion sections to resolve autosectionlabel conflicts:

• Add serving-conclusion label (eager_tutorials/serving.rst)
• Add pt2e_quant_xpu_inductor-conclusion label
• Add pt2e_quantizer-conclusion label
• Add pt2e_quant_ptq-conclusion label
• Add pt2e_quant_openvino_inductor-conclusion label
• Add pt2e_quant_qat-conclusion label
• Add pt2e_quant_x86_inductor-conclusion label

Resolves 7 duplicate conclusion label warnings from issue #3863

[pytorch-bot]

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