RFR: 8319166: Typos in the JavaDocs for MemorySegment

[Maurizio Cimadamore]

On Thu, 2 Nov 2023 07:40:52 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to fix a number of JavaDoc typos in the `MemorySegment::getAtIndex` and `::setAtIndex`.

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16469#pullrequestreview-1710069176