Fixed indentation that used tabs instead of spaces

Signed-off-by: Stefan Cyliax <stefan.cyliax@asam.net>

Author: Stefan Cyliax

osi_featuredata.proto

@@ -451,10 +451,10 @@ message LidarDetection
     optional double reflectivity = 10;
 
     // Echo pulse width of the detection's echo.
-	// Several sensors output an echo-pulse width instead of an intensity for each single detection.
-	// It is measured in m and measures the extend of the object parts or atmospheric particles that produce the echo.
-	// As an example, it is depicted for the two echos reflected from the edges A-B and C-D in Fig. 7 from [Rosenberger et al.](https://link.springer.com/content/pdf/10.1007/s41104-020-00066-x.pdf).
-	// Fig. 8 [Rosenberger et al.](https://link.springer.com/content/pdf/10.1007/s41104-020-00066-x.pdf) shows it in more detail, as the echo-pulse width is measured as the range between the rising and falling edge crossing the intensity threshold.
+    // Several sensors output an echo-pulse width instead of an intensity for each single detection.
+    // It is measured in m and measures the extend of the object parts or atmospheric particles that produce the echo.
+    // As an example, it is depicted for the two echos reflected from the edges A-B and C-D in Fig. 7 from [Rosenberger et al.](https://link.springer.com/content/pdf/10.1007/s41104-020-00066-x.pdf).
+    // Fig. 8 [Rosenberger et al.](https://link.springer.com/content/pdf/10.1007/s41104-020-00066-x.pdf) shows it in more detail, as the echo-pulse width is measured as the range between the rising and falling edge crossing the intensity threshold.
     //
     // Unit: m
     //