Update cmdlineoptions_enums.h (#4)

fix a typo

libwarpaffine/cmdlineoptions_enums.h

@@ -57,7 +57,7 @@ enum class TaskArenaImplementation
 /// Values that represent different levels of "print-out verbosity", i.e. how much
 /// output (to stdout) is generated by the application.
 /// The enums need to be ordered from "lowest level of verbosity" to "highest level of
-/// verbosity", since there numerical values are being compared.
+/// verbosity", since their numerical values are being compared.
 enum class MessagesPrintVerbosity
 {
     kMinimal = 0,