[foreign-memaccess+abi] RFR: Canonicalize header ids in foreign API javadocs

[Jorn Vernee]

[JDK-8277420](https://urldefense.com/v3/__https://github.com/openjdk/jdk/pull/8817__;!!ACWV5N9M2RV99hQ!L3upR4bp5-13v6u_qe5QxOXtSrxNGNKlbaBHWVwnjLODexrrk1mgzgCjOWAutIXchkMP-mSW-mooP0cdTHnaLw$ ) added a button to copy a link to a section of javadoc to the clipboard.

This cleanup PR canonicalizes all header ids in the java.lang.foreign package to the preferred (non-legacy) style, and adds ids in places where they are missing as well.

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Commit messages:
 - Canonicalize header ids in javadoc

Changes: https://git.openjdk.org/panama-foreign/pull/689/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=689&range=00
  Stats: 22 lines in 7 files changed: 0 ins; 1 del; 21 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/689.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/689/head:pull/689

PR: https://git.openjdk.org/panama-foreign/pull/689