RFR: 8304408: Javadoc unexpectedly reports that hybrid snippet contents mismatch

[Hannes Wallnöfer]

Please review a change to ignore leading and trailing line breaks when comparing inline and external snippet contents in a hybrid snippets. It is often hard to get leading/trailing linebreaks identical between the two, and it is generally not a significant aspect in terms of consistency. 

There is an open CSR for this issue to update the section about hybrid snippets in the doc comment spec.

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Commit messages:
 - 8304408: Javadoc unexpectedly reports that hybrid snippet contents mismatch

Changes: https://git.openjdk.org/jdk/pull/28357/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28357&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304408
  Stats: 87 lines in 2 files changed: 79 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/28357.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28357/head:pull/28357

PR: https://git.openjdk.org/jdk/pull/28357