RFR: 8012675: Updated Parser class doc to include info regarding lack of support for html script tags.

[DamonGuy]

Updated Parser class doc by appending to the doc regarding lack of support for HTML script tags. Adding this information to the "parse" function did not seem as consistent for formatting as adding it to the Parser class doc.

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Commit messages:
 - Updated Parser class doc to include info regarding lack of support for html script tags.

Changes: https://git.openjdk.java.net/jdk/pull/7446/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7446&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8012675
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7446.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7446/head:pull/7446

PR: https://git.openjdk.java.net/jdk/pull/7446