5879: Update mentions of 'ra_vfs' in architecture doc r=matklad a=rherrmann

Adjust the paragraph about `ra_vfs` to point to the `vfs` crate that is used now.


Co-authored-by: Rüdiger Herrmann <ruediger.herrmann@gmx.de>
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@ -138,14 +138,12 @@ offsets and strings as output. This works on top of rich code model powered by
An LSP implementation which wraps `ide` into a language server protocol.
### `ra_vfs`
### `crates/vfs`
Although `hir` and `ide` don't do any IO, we need to be able to read
files from disk at the end of the day. This is what `ra_vfs` does. It also
files from disk at the end of the day. This is what `vfs` does. It also
manages overlays: "dirty" files in the editor, whose "true" contents is
different from data on disk. This is more or less the single really
platform-dependent component, so it lives in a separate repository and has an
extensive cross-platform CI testing.
different from data on disk.
## Testing Infrastructure