RFR: 8284213: Replace usages of 'a the' in xml

[Alexey Ivanov]

Replaces usages of articles that follow each other in all combinations: a/the, an?/an?, the/the…

I tried to avoid changing external libraries, there are quite a few such typos.
Let me know if I should revert any files.

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Commit messages:
 - 8284213: Replace usages of 'the a' in xml
 - 8284213: Replace usages of 'the the' in xml
 - 8284213: Replace usages of 'the the' in xml
 - 8284213: Replace usages of 'the the' in xml
 - 8284213: Replace usages of 'an? an?' in xml

Changes: https://git.openjdk.java.net/jdk/pull/8769/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8769&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284213
  Stats: 17 lines in 9 files changed: 0 ins; 0 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8769.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8769/head:pull/8769

PR: https://git.openjdk.java.net/jdk/pull/8769