don't mention required twice

docs/commands/simgenotype.rst

@@ -76,7 +76,7 @@ If speed is important, it's generally faster to use PGEN files than VCFs.
   --out tests/data/example_simgenotype.pgen
 
 .. warning::
-  Writing PGEN files will require more memory than writing VCFs. The memory required will depend on the number of simulated samples and variants.
+  Writing PGEN files will require more memory than writing VCFs. The memory will depend on the number of simulated samples and variants.
   You can reduce the memory required by this step by writing the variants in chunks. Just specify a ``--chunk-size`` value.
 
 All files used in these examples are described :doc:`here </project_info/example_files>`.