Update blood.tsv example

src/modality-specific-files/positron-emission-tomography.md

@@ -444,17 +444,17 @@ as shown in the following example.
 
 **`*_recording-manual_blood.tsv`**:
 
-```Text
-time plasma_radioactivity whole_blood_radioactivity metabolite_parent_fraction metabolite_polar_fraction
-0    0    0    1    0
-145    43.31    33.79    0.5749    0.1336
-292    48.96    37.42    0.3149    0.2746
-602    39.84    32.05    0.1469    0.3548
-1248    37.38    31.52    0.073    0.444
-1785    36.40    28.83    0.078    0.429
-2390    33.13    26.32    0.061    0.453
-3059    30.83    25.22    0.049    0.473
-4196    27.28    21.98    0.036    0.503
-5407    22.70    19.49    0.032    0.523
-7193    19.71    15.70    0.02    0.559
+```tsv
+time	plasma_radioactivity	whole_blood_radioactivity	metabolite_parent_fraction	metabolite_polar_fraction
+0	0	0	1	0
+145	43.31	33.79	0.5749	0.1336
+292	48.96	37.42	0.3149	0.2746
+602	39.84	32.05	0.1469	0.3548
+1248	37.38	31.52	0.073	0.444
+1785	36.40	28.83	0.078	0.429
+2390	33.13	26.32	0.061	0.453
+3059	30.83	25.22	0.049	0.473
+4196	27.28	21.98	0.036	0.503
+5407	22.70	19.49	0.032	0.523
+7193	19.71	15.70	0.02	0.559
 ```