RFR: 8306431: File.listRoots method description should be re-examined [v7]

[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:

  Move SecurityException paragraph

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13526/files
  - new: https://git.openjdk.org/jdk/pull/13526/files/7ba2460a..3d4aed98

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=05-06

  Stats: 12 lines in 1 file changed: 6 ins; 6 del; 0 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