Improve info text

app/routes.py

@@ -45,7 +45,7 @@ def rttc():
         info=
         "Cable Round Trip Time calculated from realtime data provided by the "
         "Detector Manager. The red lines shows the median and the STD "
-        "calculated. from the last 24 hours. "
+        "from the past 24 hours. "
         "RTTC = Cable_RTT - (TX_Slave + RX_Slave + TX_Master + RX_Master)")