Clarify code owners when using sections

What does this MR do and why?

Describe in detail what your merge request does and why.

Current documentation states:

If you use sections, the last user for each section is used.

this should be replaced by:

Only the last pattern matching for each section is applied.

When a file matches multiple entries in the CODEOWNERS file, the users from last pattern matching the file of each section are used. The current wording is confusing as it seems we use only one user per section.

In the issue that implemented the section feature, it is explained that:

Allow multiple section in the CODEOWNERS file, and the most specific rule from each section wins.

(in the screenshots we see multiple users and not a single one).

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