Refactor smart contract guidelines for clarity and consistency.

[memearchivarius]

Description

Updated language for better readability in airdrop claiming, multisig wallet, and nominator pool documentation. Improved structure and formatting across multiple sections.

https://docs.ton.org/v3/guidelines/smart-contracts/guidelines

https://docs.ton.org/v3/guidelines/smart-contracts/testing/overview

https://docs.ton.org/v3/guidelines/smart-contracts/testing/writing-test-examples

https://docs.ton.org/v3/guidelines/smart-contracts/security/overview

https://docs.ton.org/v3/guidelines/smart-contracts/security/random-number-generation

https://docs.ton.org/v3/guidelines/smart-contracts/security/random

https://docs.ton.org/v3/guidelines/smart-contracts/security/secure-programming

https://docs.ton.org/v3/guidelines/smart-contracts/security/things-to-focus

https://docs.ton.org/v3/guidelines/smart-contracts/security/ton-hack-challenge-1

https://docs.ton.org/v3/guidelines/smart-contracts/howto/airdrop-claim-best-practice

https://docs.ton.org/v3/guidelines/smart-contracts/howto/multisig-js

https://docs.ton.org/v3/guidelines/smart-contracts/howto/multisig

https://docs.ton.org/v3/guidelines/smart-contracts/howto/nominator-pool

https://docs.ton.org/v3/guidelines/smart-contracts/howto/shard-optimization

https://docs.ton.org/v3/guidelines/smart-contracts/howto/single-nominator-pool

Closes #1027

Checklist

• I have created an issue.
• I am working on content that aligns with the Style guide.
• I have reviewed and formatted the content according to Content standardization.
• I have reviewed and formatted the text in the article according to Typography.

[reveloper]

@memearchivarius, great job!