LilyPond Contributor's Guide: 10.8.4 Automatically update documentation

### 10.8.4 Automatically update documentation

`convert-ly` should be used to update the documentation, the snippets, and the regression tests. This not only makes the necessary syntax changes, it also tests the `convert-ly` rules.

The automatic updating is performed by moving to the top-level source directory, then running:

>     scripts/auxiliar/update-with-convert-ly.sh

If you did an out-of-tree build, pass in the relative path:

>     BUILD_DIR=../build-lilypond/ scripts/auxiliar/update-with-convert-ly.sh

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