RFR: 8273641: (bf) Buffer subclasses documentation contains template strings

[Brian Burkhalter]

Please consider this doc-only fix. The template processor apparently does not like the HTML space entity ` `.

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Commit messages:
 - 8273641: (bf) Buffer subclasses documentation contains template strings

Changes: https://git.openjdk.java.net/jdk/pull/5502/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5502&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273641
  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5502.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5502/head:pull/5502

PR: https://git.openjdk.java.net/jdk/pull/5502