Fix several typos across the project

[victorpolko]

There's no issue for this PR, sorry.

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[gemini-code-assist]

Summary of Changes

Hello @victorpolko, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the overall quality and readability of the project's codebase and documentation by addressing several minor textual inaccuracies. The changes primarily involve correcting typos and improving grammatical phrasing across various files, leading to clearer explanations and more precise code comments, ultimately improving maintainability and user understanding.

Highlights

• Documentation and Comments: Corrected numerous spelling and grammatical errors across various documentation files and code comments, enhancing clarity and readability.
• Code Clarity: Improved the precision of method descriptions and error messages, such as clarifying the supported Kdbx versions in KdbxHeader.
• Naming Convention: Standardized a local function name from valueToSting to valueToString in print_utils.dart for consistency.

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Changelog

• README.md
  • Corrected 'libraris' to 'libraries' in the Argon2 support section.
  • Corrected 'Commnity' to 'Community' in the Windows installation instructions.
• lib/src/credentials/keyfile.dart
  • Corrected 'keypass' to 'KeePass' in a comment describing hex formatting.
• lib/src/internal/consts.dart
  • Changed 'Support since kdbx 4.' to 'Supported since kdbx 4.' for grammatical correctness.
• lib/src/internal/pointycastle_argon2.dart
  • Corrected 'Argon KDF' to 'Argon2 KDF' in a class description comment.
• lib/src/kdbx_dao.dart
  • Corrected 'modifing' to 'modifying' in a comment describing the helper object.
• lib/src/kdbx_file.dart
  • Corrected 'thread save' to 'thread safe' in a comment explaining a lock's purpose.
• lib/src/kdbx_header.dart
  • Corrected 'user KdbxVersion' to 'use KdbxVersion' in a TODO comment.
  • Corrected 'engouh' to 'enough' in a TODO comment related to algorithm security.
  • Reworded an exception message from 'We do not support Kdbx 3.x and 4.x right now.' to 'Unsupported Kdbx version $version. Only 3.x and 4.x are supported.' for improved clarity.
• lib/src/kdbx_object.dart
  • Corrected 'the all modifications' to 'all modifications' in a comment.
• lib/src/utils/print_utils.dart
  • Renamed the local function valueToSting to valueToString.

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[gemini-code-assist]

Code Review

The pull request successfully addresses several typos and naming inconsistencies across the project. The fixes improve documentation clarity, technical accuracy (e.g., 'thread safe'), and error message correctness. The renaming of valueToSting to valueToString also enhances code maintainability. No issues were found in the modified lines.