Update hydrology-and-energy-systems.md

docs/hydrology-and-energy-systems.md

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 | [Impacts of climate change on energy systems in global and regional scenarios](https://www.nature.com/articles/s41560-020-0664-z) | Yalew et al. (2020) | Water-energy-climate | - |
 | [PyPSA-Earth. A new global open energy system optimization model demonstrated in Africa](https://www.sciencedirect.com/science/article/pii/S0306261923004609) | Parzen et al. (2023) | Power system modelling | - |
 | [Impacts of climate change, policy and Water-Energy-Food nexus on hydropower development](https://www.sciencedirect.com/science/article/abs/pii/S0960148117309928) | Zhang et al. (2018) | Water-energy-food | - |
-| [A review of the current state of research on the water, energy, and food nexus] (https://www.sciencedirect.com/science/article/pii/S2214581815001251) | Endo et al. (2017) | Water-energy-food | - |
+| [A review of the current state of research on the water, energy, and food nexus](https://www.sciencedirect.com/science/article/pii/S2214581815001251) | Endo et al. (2017) | Water-energy-food | - |
 
 ## Southeast Asia