Improve README Documentation for Abstract Global Wallet Examples

[podZzzzz]

Description

This pull request updates the README files across multiple directories to improve clarity and consistency in documentation. Key changes include:

• Refinement of wording: Changed occurrences of "showcases" to "demonstrates" for a more precise description of functionality.
• Grammar and readability improvements: Adjusted sentence structures for better readability.
• Consistency updates: Standardized how instructions are phrased across different README files.
• Fixed minor typos: Corrected pre-defined → predefined, Run → Start, and other minor inconsistencies.

Files Updated

• agw-connectkit-nextjs/README.md
• agw-dynamic-nextjs/README.md
• agw-nextjs/README.md
• agw-privy-nextjs/README.md
• agw-rainbowkit-nextjs/README.md
• agw-thirdweb-nextjs/README.md
• session-keys/README.md

Changes Summary

• Session keys documentation: Improved phrasing to make descriptions more fluid and intuitive.
• Installation and development instructions: Added "the" before "dependencies" for grammatical accuracy.
• Standardization of terminology: Ensured uniformity across different integrations (ConnectKit, Dynamic, RainbowKit, etc.).
• Fixed formatting and minor structural inconsistencies.

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PR-Codex overview

This PR focuses on improving the clarity and consistency of the documentation across various README.md files related to the Abstract Global Wallet SDK. It replaces the word "showcases" with "demonstrates" and makes minor adjustments for improved readability.

Detailed summary

• Changed "showcases" to "demonstrates" in multiple README.md files.
• Clarified descriptions of session keys and their functionality.
• Updated instructions for installing dependencies and starting the development server for better clarity.
• Added a newline at the end of the README.md for Discord link.

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Name	Status	Preview	Comments	Updated (UTC)
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