Update mop.r.n.yaml long_name

Signed-off-by: Derek Hower <[email protected]>

Author: dhower-qc

arch/inst/Zimop/mop.r.n.yaml

@@ -3,7 +3,7 @@
 $schema: "inst_schema.json#"
 kind: instruction
 name: mop.r.n
-long_name: May be an OPeration (1 source register).
+long_name: May-be-operation (1 source register).
 description: |
   Unless redefined by another extension, this instructions simply writes 0 to X[xd].
   The encoding allows future extensions to define them to read X[xs1], as well as write X[xd].