Tidy up README.md

Co-authored-by: Andrew Kiss <[email protected]>
COSIMA · Nov 6, 2024 · d0c399a · d0c399a
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@@ -135,7 +135,8 @@ Options
 ## min_dy
 
 ```
-usage: topogtools min_dy --input <input_file> --output <output_file> --hgrid <grid> --cutoff <cutoff_value>       
+usage: topogtools min_dy --input <input_file> --output <output_file> --cutoff <cutoff_value>
+                        [--hgrid <hgrid_file>]
 ```
 
 Convert ocean cells into land if their y size is smaller than `<cutoff_value>`, expressed in the same units as `dy` in `<hgrid_file>` (typically metres).