Improve the "Making Good PRs" section

I often see PRs with misleading or vague titles. This is problematic, as the PR titles often end up being the commit titles, and commit titles are one of the most important tools we have when searching for historic changes. Bad titles impact maintainability.

Suggested edits:

• Enforce a strict title format
• Promote writing accurate and concise PR titles/descriptions

Perhaps the "Making Good PRs" section can be further promoted. Would it make sense to extract it and move it a level up in the doc hierarchy?

首先在开发者指南中找到“Making Good PRs”部分，并查看其周围的文档层级。确定该部分应如何说明准确、简洁的 pull request 标题和描述，以及它是否应位于更高层级。完成的标准是，指南及其位置清楚地体现 issue 建议的改进。