Update README.md

README.md

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 ```
 
 The first line is used to build .rst files by reading the code in the package given by path_to_package (for example src/CMM). These files are stored in docs but not saved on Github for simplicity.
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 The second line reads the .rst files and converts them into .html files, which we use to generate the API documentation.
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 After a modification, if you want to visualize the documentation before committing it, you can use Firefox (or any other application) :
 
 ```