RFR: JDK-8253936 Replace <code>...</code> with {@code ...} for java.sql

[Vipin Sharma]

<code>...</code> is replaced with {@code ...} in java.sql classes.
Please review and sponsor this change.

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Commit messages:
 - JDK-8253936 Replace <code>...</code> with {@code ...} for java.sql

Changes: https://git.openjdk.java.net/jdk/pull/707/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=707&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253936
  Stats: 4698 lines in 58 files changed: 0 ins; 0 del; 4698 mod
  Patch: https://git.openjdk.java.net/jdk/pull/707.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/707/head:pull/707

PR: https://git.openjdk.java.net/jdk/pull/707