Update docs/software/uenv/guides.md

Co-authored-by: Alberto Invernizzi <[email protected]>

Author: bcumming

docs/software/uenv/guides.md

@@ -116,7 +116,7 @@ module load ncview
 
 It is possible to create a custom command that will start a new shell with a uenv loaded, with additional customizations to the environment (e.g. loading modules and setting environment variables).
 
-The first step is to create a script that performs the the customization steps to perform once the uenv has been loaded.
+The first step is to create a script that performs the customization steps to perform once the uenv has been loaded.
 Here is an example for an environment called `myenv`:
 
 ```bash title="~/.myenvrc"