The PSD caption is changed

Co-authored-by: Mark Haslinghuis <mark@numloq.nl>

Author: demvlad

index.html

@@ -458,7 +458,7 @@ <h4>Workspace</h4>
                                 <option value="0">Frequency</option>
                                 <option value="1">Freq. vs Throttle</option>
                                 <option value="2">Freq. vs RPM</option>
-                                <option value="3">Power spectral density</option>
+                                <option value="3">Power Spectral Density</option>
                                 <option value="4">PSD vs Throttle</option>
                                 <option value="5">PSD vs RPM</option>
                                 <option value="6">Error vs Setpoint</option>