in_tail: Add descriptions for encoding parameters on in tail

[cosmo0920]

This is subsequent PR of #1471.

Also I added the reason why we need to support these parameters and how
to use them.

[lecaros]

@fluent/chronosphere-tech-writers could you please review this one? Thanks in advance!

[alexakreizinger]

suggested some changes for style, but adding my approval based on those 😁 happy to take another look if you need to make changes to any of my changes, too. (also I want to make sure any changes stay in sync with #1471!)

[eschabell]

@cosmo0920 if you can resolve the conflicts, I can get this merged together with #1471

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

markdownlint

---

[markdownlint] _{reported by reviewdog 🐶}
MD004/ul-style Unordered list style [Expected: dash; Actual: asterisk]

fluent-bit-docs/pipeline/inputs/tail.md

Line 529 in e54556f

* `Win874` (Thai): (Alias: `CP874`)

[eschabell]

@cosmo0920 this is still in conflict... did get #1471 merged this morning my time, can you revisit?

[eschabell]

@esmerel good morning! The only thing holding back merging this PR are a couple of Vale checks showing the following errors:

Raw Output:
{"message": "[FluentBit.Contractions] Feel free to use 'aren't' instead of 'are not'.", "location": {"path": "pipeline/inputs/tail.md", "range": {"start": {"line": 484, "column": 59}}}, "severity": "INFO"}
Error: [vale] reported by reviewdog 🐶
[FluentBit.Latin] Use 'for example' instead of 'e.g.,'.

Raw Output:
{"message": "[FluentBit.Units] Put a nonbreaking space between the number and the unit in '16B'.", "location": {"path": "pipeline/inputs/tail.md", "range": {"start": {"line": 502, "column": 9}}}, "severity": "INFO"}
Error: reviewdog: Too many results (annotations) in diff.
You may miss some annotations due to GitHub limitation for annotation created by logging command.
Please check GitHub Actions log console to see all results.

Can you take a look at this?

[github-actions]

[markdownlint] _{reported by reviewdog 🐶}
MD024/no-duplicate-heading Multiple headings with the same content [Context: "### Configuration parameters"]

[esmerel]

@esmerel good morning! The only thing holding back merging this PR are a couple of Vale checks showing the following errors:

Can you take a look at this?

Done! Don't worry about copying the errors out, I can see them in the web interface. If I get pinged I will try to fix them as I get time. =)