Correct TRD info files

Correct misinformation in TRD info files. Acceptance calculated with assumption target was at z=0 instead of -40 cm (old) or (-44 cm current)

Information in redmine https://redmine.cbm.gsi.de/issues/3078

Bug releaved itself during review for !224 (merged)

trd/trd_v20a_1e.geo.info

@@ -39,13 +39,13 @@
 -247.500000 cm to 247.500000 cm y-dimension of layer  3
 -247.500000 cm to 247.500000 cm y-dimension of layer  4
 
-# angles of acceptance for inner + outer modules
+# angles of acceptance for inner + outer modules considering the target at z=0
 vi: 28.77 deg, vo: 27.91 deg, h: 33.73 deg - vertical/horizontal - layer  1
 vi: 25.48 deg, vo: 24.70 deg, h: 30.10 deg - vertical/horizontal - layer  2
 vi: 22.83 deg, vo: 22.11 deg, h: 27.12 deg - vertical/horizontal - layer  3
 vi: 20.66 deg, vo: 19.99 deg, h: 24.64 deg - vertical/horizontal - layer  4
 
-# inner aperture
+# inner aperture considering the target at z=0
 v:  3.49 deg, h:  6.96 deg - vertical/horizontal - layer  1
 v:  3.03 deg, h:  6.05 deg - vertical/horizontal - layer  2
 v:  2.68 deg, h:  5.35 deg - vertical/horizontal - layer  3