chore(docs): update content for legal

[itsacoyote]

Resolves DEVRL-704, DEVRL-708, DEVRL-709, DEVRL-711

• Made edits to the description of the Paymaster in quickstart and zksync 101.
• Added disclaimers to paymaster page for quickstart and zksync 101.
• Added a Paymaster entry to the Glossary.
• Added a disclaimer to the ERC20 page for quickstart.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 0fafc97):

https://zksync-docs-staging-5eb09--pr90-itsacoyote-devrl-707-4pxcvnq8.web.app

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