cli: clarify --cpu-prof-name allowed values

Refs: #57418

Author: cecia234

doc/api/cli.md

@@ -495,6 +495,8 @@ in the current working directory.
 If `--cpu-prof-name` is not specified, the generated profile is
 named `CPU.${yyyymmdd}.${hhmmss}.${pid}.${tid}.${seq}.cpuprofile`.
 
+If `--cpu-prof-name` is specified, the provided value will be used as-is; patterns such as `${hhmmss}` or `${pid}` are not supported.
+
 ```console
 $ node --cpu-prof index.js
 $ ls *.cpuprofile