Update ReadMe.md

Author: zhihuanli

ReadMe.md

@@ -63,7 +63,7 @@
       - [3.Automatic intrinsic calibration of double-sided silicon strip detectors](./chapt3/DSSD_cali.pdf)
       - [4.DSSD Adjacent strip correlations.pdf](./chapt3/DSSD_Adjacent.pdf)
  - 3.5 [DSSD front-back correlation (II)](https://zhihuanli.github.io/Experimental-Data-Analysis-Course/chapt3/3.5_DSSD_FB_correlation_II_DSSD1.html)
- - 3.6 [DSSD多重性分析](https://zhihuanli.github.io/Experimental-Data-Analysis-Course/chapt3/3.6_DSSD_Multiplicity_Analysis.html)
+ - 3.6 [DSSD Multiplicity Event Analysis](https://zhihuanli.github.io/Experimental-Data-Analysis-Course/chapt3/3.6_DSSD_Multiplicity_Analysis.html)
  - 3.7 [DSSD数据分析](https://zhihuanli.github.io/Experimental-Data-Analysis-Course/chapt3/3.7_DSSD_data_analysis.html)
  - 3.8* [用vector存储TTree数据](https://zhihuanli.github.io/Experimental-Data-Analysis-Course/chapt3/3.7_TTree_Branch_with_vector.html) 
       - 代码见[code](https://github.com/zhihuanli/Experimental-Data-Analysis-Course/tree/master/chapt3/code)