in_opentelemetry: added five missing configuration option descriptions [backport 4.0]

[eschabell]

Backported fix to Fluent Bit 4.0 for 5 missing config option descriptions in opentelemetry input plugin.

Applies to #11191.

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Testing
Before we can approve your change; please submit the following in a comment:

• [N/A] Example configuration file for the change
• [N/A] Debug log output from testing the change
• [N/A] Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature
  Docs PR: Updated 5 configuration options descriptions for otel input plugin for corresponding code update. Fixes #2181. fluent-bit-docs#2182

Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

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