Update signing providers

[arhtudormorar]

Description of the pull request (what is new / what has changed)

When users read the signing providers page, they need more context about what to start with instead of jumping into implementing signing providers themselves

This PR also fixes some grammar issues in sdk-dapp docs

Did you test the changes locally ?

• yes
• no

Which category (categories) does this pull request belong to?

• document new feature
• update documentation that is not relevant anymore
• add examples or more information about a component
• fix grammar issues
• other

[Copilot]

Pull Request Overview

Updates documentation to provide better guidance for users when working with signing providers and fixes various grammar issues throughout the sdk-dapp documentation.

• Adds context and examples for users to start with when implementing signing providers
• Corrects multiple spelling and grammar errors in the sdk-dapp documentation
• Improves code formatting and structure consistency

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/sdk-and-tools/sdk-js/sdk-js-signing-providers.md	Adds recommended template examples for different frameworks to guide users before implementing signing providers
docs/sdk-and-tools/sdk-dapp/sdk-dapp.md	Fixes numerous spelling, grammar, and formatting issues throughout the documentation

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The merge-base changed after approval.