sg feedback - sg generate writing config overwrite

### Discussed in https://github.com/sourcegraph/sourcegraph/discussions/38233

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<sup>Originally posted by **mrnugget** July  5, 2022</sup>
sg generate writes custom commandsets into doc/dev/background-information/sg/reference.md.


### `sg` information

Commit: `9820615b14d6894f848ed69f1fd13a02b8026089`
Command: `sg feedback`
Flags: ``
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