Remove unused exception parameter from pytorch/text/examples/libtorch…

…text/tokenizer/main.cpp

Summary:
`-Wunused-exception-parameter` has identified an unused exception parameter. This diff removes it.

This:
```
try {
    ...
} catch (exception& e) {
    // no use of e
}
```
should instead be written as
```
} catch (exception&) {
```

If the code compiles, this is safe to land.

Reviewed By: dmm-fb

Differential Revision: D58830948

fbshipit-source-id: 129097585ca4b0ae2ef3ef1621c290ea52375282

quic/server/handshake/ServerHandshake.h

@@ -44,7 +44,7 @@ namespace quic {
  *     auto writeBytes = handshake->getWriteBytes();
  *     auto hanshakeState = handshake->getHandshakeState();
  *     writeBytesToSocket(writeBytes);
- *   } catch (const QuicTransportException& ex) {
+ *   } catch (const QuicTransportException&) {
  *     ....
  *   }
  *  }