RFR: 8261670: Add javadoc for the XML processing limits [v2]

[Joe Wang]

> Add the documentation for XML processing limits to module summary. The limits were previously documented in Java tutorial and guide.

Joe Wang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'master' into JDK-8261670
 - 8261670: Add javadoc for the XML processing limits

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Changes: https://git.openjdk.java.net/jdk/pull/2732/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2732&range=01
  Stats: 87 lines in 1 file changed: 81 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2732.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2732/head:pull/2732

PR: https://git.openjdk.java.net/jdk/pull/2732