Update README.md - correct typos.

README.md

@@ -67,11 +67,11 @@ For us to start working on the processing / CMORisation of your simulations, we
 This information can be provided via a GoogleSpreadsheet: [LINK](https://docs.google.com/spreadsheets/d/10WIxv98KMEIFQXSCVnesfly5u9ymsJW72u_WUamlJq8/edit?usp=sharing)
 Please request editing access for this GoogleSpreadsheet, select your model ...
 
-![SimulationSpreadsheet](docs/source/SimulationISpreadsheet.png)
+![SimulationSpreadsheet](docs/source/SimulationSpreadsheet.png)
 
 ... and fill in the required information for each simulation. Please use already added simulations as example.
 
-![SimulationModelingGroups](docs/source/SimulationISpreadsheet_ModelingGroups.png)
+![SimulationModelingGroups](docs/source/SimulationSpreadsheet_ModelingGroups.png)
 
 Please notify us in your [Register a new experiment](#RegisterExperiment) GitLab Issue when you added all simulation specific information or assistance is required.