doc: revise REPL uncaught exception text

Simplify the text about uncaught exceptions in the REPL.

PR-URL: https://github.com/nodejs/node/pull/30729


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>