RFR: 8374296: Comment clean up in os_linux.cpp

[Kevin Walls]

In src/hotspot/os/linux/os_linux.cpp this comment no longer shows where there is time support code:

 ////////////////////////////////////////////////////////////////////////////////
 // time support


Orphaned since JDK-8372625, trivially remove.

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Commit messages:
 - 8374296: Comment clean up in os_linux.cpp

Changes: https://git.openjdk.org/jdk/pull/28963/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28963&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374296
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28963.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28963/head:pull/28963

PR: https://git.openjdk.org/jdk/pull/28963