Clarify error address calculation methods

[answer-huang]

Related to #68

Adds detailed explanation on error address calculation methods to the README

• Introduces a new section titled "Understanding Error Address Calculation Methods" before the "更新：" section in the README.md file.
• Explains the significance of using offset filling methods for error address calculation, clarifying the difference between the two methods (with and without offset) and when to use each.
• Highlights the importance of matching the error report source with the appropriate calculation method for accurate error address calculation.

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