Updating Documentation link in export_inference_graph.py

[kumariko]

Updating broken Documentation link : https://tensorflow.github.io/serving/serving_basic.html with correct link : https://www.tensorflow.org/tfx/serving/serving_basic.html in export_inference_graph.py . ref #10276

Description

Updating broken Documentation link

Type of change

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Note: Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Documentation update
• TensorFlow 2 migration
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• A new research paper code implementation
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Tests

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Test Configuration:

Checklist

• I have signed the Contributor License Agreement.
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• My code follows the coding guidelines.
• I have performed a self code review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.

[kumariko]

@tombstone @pkulzc @jch1 any update on this PR?