[Feature] Update pdf-processing example

[sujee]

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• I searched the issues and found no similar issues.

Component

Other

Feature

Update examples/notebook/intro example with

• user newer / simpler APIs
• update workflow (pdf --> pq --> docid --> ededupe --> fuzzy dedupe --> doc quality)
• rename the example as pdf-processing-1

Are you willing to submit a PR?

• Yes I am willing to submit a PR!