[foreign-memaccess] RFR: 8247924: Improve javadoc of Foreign Memory Access API (part three)

[Maurizio Cimadamore]

Fix bad references `ByteOrder.NATIVE_ORDER`

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Commit messages:
 - Fix mistake in javadoc

Changes: https://git.openjdk.java.net/panama-foreign/pull/213/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/213/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247924
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/213.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/213/head:pull/213

PR: https://git.openjdk.java.net/panama-foreign/pull/213