RFR: 8306431: File.listRoots method description should be re-examined [v9]

[Nagata-Haruhito]

> I fixed File.listRoots description.
> * remove "the insertion or ejection of removable media"
> * change "available" to "existing"
> 
> Please review this change.

Nagata-Haruhito has updated the pull request incrementally with one additional commit since the last revision:

  Follow CSR description

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13526/files
  - new: https://git.openjdk.org/jdk/pull/13526/files/840cd7dc..5b230746

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=07-08

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13526.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13526/head:pull/13526

PR: https://git.openjdk.org/jdk/pull/13526