[jdk17] RFR: JDK-8268236 The documentation of the String.regionMatches method contains error

[Jim Laskey]

The documentation of the String.regionMatches method contains this fragment: this.substring(toffset, len).codePoints(), but String.substring method takes index, not the length, as the second argument.

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Commit messages:
 - Update javadoc

Changes: https://git.openjdk.java.net/jdk17/pull/157/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=157&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268236
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/157.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/157/head:pull/157

PR: https://git.openjdk.java.net/jdk17/pull/157