fix some url (#383)

Author: malmans2

Satellite_ECVs/Ocean/satellite_satellite-sea-ice-thickness_trend-assessment_q01.ipynb

@@ -959,11 +959,11 @@
     "\n",
     "### References\n",
     "\n",
-    "1. Tilling, R. L., Ridout, A., & Shepherd, A. (2018). Estimating Arctic sea ice thickness and volume using CryoSat-2 radar altimeter data. Advances in Space Research, 62(6), 1203-1225, [<span style=\"color:blue\">https://doi.org/10.1016/j.asr.2017.10.051</span>](https://doi.org/10.1016/j.asr.2017.10.051).\n",
+    "1. Tilling, R. L., Ridout, A., & Shepherd, A. (2018). Estimating Arctic sea ice thickness and volume using CryoSat-2 radar altimeter data. Advances in Space Research, 62(6), 1203-1225, [<span style=\"color:blue\"> https://doi.org/10.1016/j.asr.2017.10.051 </span>](https://doi.org/10.1016/j.asr.2017.10.051).\n",
     "\n",
-    "2. Müller, F. L., Paul, S., Hendricks, S., and Dettmering, D. (2023). Monitoring Arctic thin ice: a comparison between CryoSat-2 SAR altimetry data and MODIS thermal-infrared imagery. The Cryosphere, 17, 809–825, [<span style=\"color:blue\">https://doi.org/10.5194/tc-17-809-2023</span>](https://doi.org/10.5194/tc-17-809-2023).\n",
+    "2. Müller, F. L., Paul, S., Hendricks, S., and Dettmering, D. (2023). Monitoring Arctic thin ice: a comparison between CryoSat-2 SAR altimetry data and MODIS thermal-infrared imagery. The Cryosphere, 17, 809–825, [<span style=\"color:blue\"> https://doi.org/10.5194/tc-17-809-2023 </span>](https://doi.org/10.5194/tc-17-809-2023).\n",
     "\n",
-    "3. Rampal, P., J. Weiss, and D. Marsan (2009). Positive trend in the mean speed and deformation rate of Arctic sea ice, 1979–2007, J. Geophys. Res., 114, C05013, [<span style=\"color:blue\">https://doi.org/10.1029/2008JC005066</span>](https://doi.org/10.1029/2008JC005066)."
+    "3. Rampal, P., J. Weiss, and D. Marsan (2009). Positive trend in the mean speed and deformation rate of Arctic sea ice, 1979–2007, J. Geophys. Res., 114, C05013, [<span style=\"color:blue\"> https://doi.org/10.1029/2008JC005066 </span>](https://doi.org/10.1029/2008JC005066)."
    ]
   }
  ],