Fix typos and broken links in contribution guidelines.

[Ilyass-Bougati]

Correct spelling of "Minimal" and "Reproducible" in the issue reporting section.

Fix broken AsciiDoc link syntax for the "Minimal Reproducible Example" and "Testcontainers" links, which were using Markdown syntax.

Address minor grammar and punctuation issues:

• Change "rearrange to commits" to "rearrange the commits".
• Change "preferable" to "preferably".
• Remove unnecessary comma in "Source Code style" section.
• Fix an incomplete sentence regarding IDE profiles in "Source Code style".

[mp911de]

Thank you for your contribution. That's merged and backported now.