Update doc/user-guide/terminology.rst

Co-authored-by: Tom Nicholas <[email protected]>

doc/user-guide/terminology.rst

@@ -223,7 +223,7 @@ complete examples, please consult the relevant documentation.*
             combined_ds
 
     lazy
-        When working with xarray, you often deal with big sets of data. Instead of doing
+Instead of doing
         calculations right away, xarray lets you plan what calculations you want to do, like finding the
         average temperature in a dataset.This planning is called "lazy evaluation." Later, when
         you're ready to see the final result, you tell xarray, "Okay, go ahead and do those calculations now!"