[openjdk-11, -17, 21] Update override comments for unstripped-binary-or-object.

Vladimir Petkorequested to merge
vpa1977/openjdk:update-overrides-21 into openjdk-21

Changes:

  * Update override comments for unstripped-binary-or-object. We need to
    keep symbols for Native Memory Tracking to work.
Edited by Vladimir Petko

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