view .arcconfig @ 46516:921e1253c8ba

gendoc: support defaults on customopts a bit better

Without this, a customopt will very likely render like this:

```
-foo   does foo (default: <hgext.myextension.MyOpt object at 0x7f31...>)
```

I copied this logic from how this is handled in mercurial/help.py.

Differential Revision: https://phab.mercurial-scm.org/D9988

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