RFR: 8338140: (str) Add notes to String.trim and String.isEmpty pointing to newer APIs [v3]

[Stuart Marks]

> Add a note to String.trim pointing to the String.strip family of methods.
> 
> Add notes cross-linking String.isBlank and String.isEmpty.

Stuart Marks has updated the pull request incrementally with one additional commit since the last revision:

  Update wording per suggestion.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25762/files
  - new: https://git.openjdk.org/jdk/pull/25762/files/96c15c33..2aa43d12

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25762&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25762&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25762.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25762/head:pull/25762

PR: https://git.openjdk.org/jdk/pull/25762