chore: Enhance documentation for FragmentsManager usage

[MiguelG97]

Description

Added documentation on utilizing the FragmentsManager component and its advantages.

Additional context

Several users have expressed confusion about whether they should be using FragmentsModel or FragmentsManager. This PR adds additional documentation to guide users in their implementations and help avoid unnecessary complexity.

References

reference 1
reference 2

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following:

• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Follow the Conventional Commits v1.0.0 standard for PR naming (e.g. feat(examples): add hello-world example).
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.