RFR: 8306431: The documentation of File.listRoots should be modifid after JDK-8208077 [v2]

[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:

  8306431: The documentation of File.listRoots should be modifid after JDK-8208077

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13526/files
  - new: https://git.openjdk.org/jdk/pull/13526/files/4a90d283..ff1a5ce5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=00-01

  Stats: 12 lines in 1 file changed: 7 ins; 4 del; 1 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