simplify omit description

Author: sjpb

README.md

@@ -104,11 +104,10 @@ partition configuration for each.
 `openhpc_cluster_name`: name of the cluster.
 
 `openhpc_config`: Optional. Mapping of additional parameters and values for
-[slurm.conf](https://slurm.schedmd.com/slurm.conf.html). Keys are parameter
-names and values are lists or strings as appropriate. This can be used to
-supplement or override the template defaults, or to remove a template parameter
-by setting the value to `'omit'` - note this is the literal string, not the
-Ansible special variable.
+[slurm.conf](https://slurm.schedmd.com/slurm.conf.html). Keys are slurm.conf
+parameter names and values are lists or strings as appropriate. This can be
+used to supplement or override the template defaults. Templated parameters can
+also be removed by setting the value to the literal string`'omit'`.
 
 `openhpc_ram_multiplier`: Optional, default `0.95`. Multiplier used in the calculation: `total_memory * openhpc_ram_multiplier` when setting `RealMemory` for the partition in slurm.conf. Can be overriden on a per partition basis using `openhpc_slurm_partitions.ram_multiplier`. Has no effect if `openhpc_slurm_partitions.ram_mb` is set.