RFR: 8288619: Unexpected parsing for @see

[Guoxiong Li]

Hi all,

When invoking the method `DocCommentParser::quotedString` with field `newline` as `true` 
and the quoted string has the character `@`, `quotedString` will break the loop and return `null`.
This patch changes the field `newline` to `false` at the beginning of the method `quotedString`
to solve this issue. And a corresponding test case is added.

Thanks for the review.

Best Regards,
-- Guoxiong

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Commit messages:
 - JDK-8288619

Changes: https://git.openjdk.org/jdk/pull/13888/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13888&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288619
  Stats: 21 lines in 2 files changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13888.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13888/head:pull/13888

PR: https://git.openjdk.org/jdk/pull/13888