RFR: 8328627: JShell documentation should be clearer about "remote runtime system" [v2]

[Jan Lahoda]

> This change attempts to more clearly explain the difference between `-J` and `-R` for JShell.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Updating the documentation as suggested.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18450/files
  - new: https://git.openjdk.org/jdk/pull/18450/files/b1b24aca..97cd0232

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18450&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18450&range=00-01

  Stats: 33 lines in 2 files changed: 2 ins; 5 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/18450.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18450/head:pull/18450

PR: https://git.openjdk.org/jdk/pull/18450