Add inventory object and template docs

Merged Mikhail Mazurskiy requested to merge ash2k/gitops-docs into master

What does this MR do?

This MR adds new documentation about inventory object, inventory object template, object adoption and cleans up some minor doc issues.

Related issues

Closes #332227 (closed).

Author's checklist (required)

Do not add the feature, frontend, backend, ~"bug", or database labels if you are only updating documentation. These labels will cause the MR to be added to code verification QA issues.

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1. Primary Reviewer

  • Review by a code reviewer or other selected colleague to confirm accuracy, clarity, and completeness. This can be skipped for minor fixes without substantive content changes.

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For suggestions that you are confident don't need to be reviewed, change them locally and push a commit directly to save others from unneeded reviews. For example:

  • Clear typos, like this is a typpo.
  • Minor issues, like single quotes instead of double quotes, Oxford commas, and periods.

For more information, see our documentation on Merging a merge request.

3. Maintainer

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  3. If there has not been a technical writer review, create an issue for one using the Doc Review template.
Edited by Marcia Ramos