Update llvm/docs/Telemetry.rst

Co-authored-by: Alina Sbirlea <alina.g.simion@gmail.com>

llvm/docs/Telemetry.rst

@@ -166,7 +166,7 @@ To use Telemetry in your tool, you need to provide a concrete implementation of
  }
  private:
  void emitToAllDestinations(const TelemetryInfo* Entry) {
- // Note: could do this in paralle, if needed.
+ // Note: could do this in parallel, if needed.
  for (Destination* Dest : Destinations)
  Dest->emitEntry(Entry);
  }