Fix typos on several .md files

[sbarrio]

What does this PR do?

This PR fixes several typos and rephrases some paragraphs across several .md files.

Motivation

@buraizu raised several typos on this PR.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change

[sbarrio]

/merge

[dd-devflow-routing-codex]

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2025-09-04 09:51:27 UTC ℹ️ Start processing command /merge

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2025-09-04 09:51:39 UTC ℹ️ MergeQueue: waiting for PR to be ready

This merge request is not mergeable yet, because of pending checks/missing approvals. It will be added to the queue as soon as checks pass and/or get approvals.
Note: if you pushed new commits since the last approval, you may need additional approval.
You can remove it from the waiting list with /remove command.

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2025-09-04 10:22:14 UTC ℹ️ MergeQueue: merge request added to the queue

The expected merge time in develop is approximately 43m (p90).

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2025-09-04 10:31:21 UTC ⚠️ MergeQueue: This merge request build was cancelled

[email protected] cancelled this merge request build

[sbarrio]

/merge -c

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-09-04 10:31:16 UTC ℹ️ Start processing command /merge -c