Update README.md

[danielchalef]

fix graphiti docs link

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:rocket:	This description was created by Ellipsis for commit 177a68ccf5c1d8fae70186a09be4526d5f76117f

Summary:

Fixes the Graphiti documentation link in README.md.

Key points:

• Updated README.md to fix the Graphiti documentation link.
• Changed URL from https://help.getzep.com/Graphiti/Graphiti to https://help.getzep.com/graphiti.

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