RFR: 8306431: File.listRoots method description should be re-examined [v10]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 11 additional commits since the last revision:

 - Merge branch 'openjdk:master' into File_javadoc
 - Follow CSR description
 - Refer review comment
 - Move SecurityException paragraph
 - Merge branch 'File_javadoc' of https://github.com/Nagata-Haruhito/jdk into File_javadoc
 - Merge branch 'openjdk:master' into File_javadoc
 - Merge branch 'openjdk:master' into File_javadoc
 - Drop exist to available
 - Merge branch 'master' into File_javadoc
 - 8306431: The documentation of File.listRoots should be modifid after JDK-8208077
 - ... and 1 more: https://git.openjdk.org/jdk/compare/2a65ba10...fe3d1573

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13526/files
  - new: https://git.openjdk.org/jdk/pull/13526/files/5b230746..fe3d1573

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13526&range=08-09

  Stats: 113072 lines in 2134 files changed: 83044 ins; 17253 del; 12775 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