RFR: 8261670: Add javadoc for the XML processing limits [v3]

[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 incrementally with one additional commit since the last revision:

  s/NumericFormatException/NumberFormatException, remove default id

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2732/files
  - new: https://git.openjdk.java.net/jdk/pull/2732/files/01695074..3e555d20

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2732&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2732&range=01-02

  Stats: 20 lines in 1 file changed: 0 ins; 3 del; 17 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