RFR: 8265330: G1: Fix comment in G1FullGCPrepareTask::G1CalculatePointersClosure [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this trivial(?) comment update?
> 
> Thanks,
>   Thomas
> 
> Testing: local compilation

Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'master' into 8265330-fix-comment
 - Fix comment

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Changes: https://git.openjdk.java.net/jdk/pull/3538/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3538&range=01
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3538.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3538/head:pull/3538

PR: https://git.openjdk.java.net/jdk/pull/3538